allow a means of overriding CFLAGS_RELEASE, as a means of passing in optimizations

61 files changed, 61 insertions, 61 deletions

diff --git a/mkspecs/aix-g++/qmake.conf b/mkspecs/aix-g++/qmake.conf
index 5eb2f5e..2dee750 100644
--- a/mkspecs/aix-g++/qmake.conf
+++ b/mkspecs/aix-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_THREAD_SAFE
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/aix-xlc-64/qmake.conf b/mkspecs/aix-xlc-64/qmake.conf
index bdbec01..49b47a7 100644
--- a/mkspecs/aix-xlc-64/qmake.conf
+++ b/mkspecs/aix-xlc-64/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= xlc
 QMAKE_CC_THREAD		= xlc_r
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -qstrict -q64 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -qwarn64
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O3
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O3)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -qthreaded -D_THREAD_SAFE
 
 QMAKE_CXX		= xlC
 QMAKE_CXX_THREAD	= xlC_r
 QMAKE_CXXFLAGS		= -+ $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/aix-xlc/qmake.conf b/mkspecs/aix-xlc/qmake.conf
index c74459d..6e17b4a 100644
--- a/mkspecs/aix-xlc/qmake.conf
+++ b/mkspecs/aix-xlc/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= xlc
 QMAKE_CC_THREAD		= xlc_r
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -qstrict $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O3
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O3)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -qthreaded -D_THREAD_SAFE
 
 QMAKE_CXX		= xlC
 QMAKE_CXX_THREAD	= xlC_r
 QMAKE_CXXFLAGS		= -+ $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/bsdi-g++/qmake.conf b/mkspecs/bsdi-g++/qmake.conf
index 4b48706..628c09b 100644
--- a/mkspecs/bsdi-g++/qmake.conf
+++ b/mkspecs/bsdi-g++/qmake.conf
@@ -10,25 +10,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	=
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/cygwin-g++/qmake.conf b/mkspecs/cygwin-g++/qmake.conf
index 9147bed..50aba89 100644
--- a/mkspecs/cygwin-g++/qmake.conf
+++ b/mkspecs/cygwin-g++/qmake.conf
@@ -9,25 +9,25 @@ TEMPLATE		= app
 CONFIG			+= qt warn_on release incremental
 QMAKE_INCREMENTAL_STYLE  = sublib
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/darwin-g++/qmake.conf b/mkspecs/darwin-g++/qmake.conf
index 9d057ea..2051427 100644
--- a/mkspecs/darwin-g++/qmake.conf
+++ b/mkspecs/darwin-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release resource_fork
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O3
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O3)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_EXTENSION_SHLIB	= dylib
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	=
 
 QMAKE_CXX		= c++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
diff --git a/mkspecs/dgux-g++/qmake.conf b/mkspecs/dgux-g++/qmake.conf
index 4de5c77..04af167 100644
--- a/mkspecs/dgux-g++/qmake.conf
+++ b/mkspecs/dgux-g++/qmake.conf
@@ -10,25 +10,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/freebsd-g++/qmake.conf b/mkspecs/freebsd-g++/qmake.conf
index 33c401e..020d6d5 100644
--- a/mkspecs/freebsd-g++/qmake.conf
+++ b/mkspecs/freebsd-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -pthread -D_THREAD_SAFE
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/hpux-acc-64/qmake.conf b/mkspecs/hpux-acc-64/qmake.conf
index 73e6093..7affcb4 100644
--- a/mkspecs/hpux-acc-64/qmake.conf
+++ b/mkspecs/hpux-acc-64/qmake.conf
@@ -50,25 +50,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -Ae +DA2.0W -w $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O +Osize
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O +Osize)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= +Z
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE
 
 QMAKE_CXX		= aCC
 QMAKE_CXXFLAGS		= -Aa +DA2.0W -w -D__STRICT_ANSI__ $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/hpux-acc-o64/qmake.conf b/mkspecs/hpux-acc-o64/qmake.conf
index d7b01b7..f47f74b 100644
--- a/mkspecs/hpux-acc-o64/qmake.conf
+++ b/mkspecs/hpux-acc-o64/qmake.conf
@@ -50,25 +50,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -Ae +DA2.0 -w $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O +Oentrysched +Onolimit
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O +Oentrysched +Onolimit)
 QMAKE_CFLAGS_DEBUG	= -y -g
 QMAKE_CFLAGS_SHLIB	= +Z
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE
 
 QMAKE_CXX		= aCC
 QMAKE_CXXFLAGS		= +DA2.0 -w -D__STRICT_ANSI__ $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= -g
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/hpux-acc/qmake.conf b/mkspecs/hpux-acc/qmake.conf
index 5990aa7..26eca39 100644
--- a/mkspecs/hpux-acc/qmake.conf
+++ b/mkspecs/hpux-acc/qmake.conf
@@ -29,25 +29,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -Ae +DAportable -w +Z $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= 
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE
 
 QMAKE_CXX		= aCC
 QMAKE_CXXFLAGS		= +DAportable -w +Z -D__STRICT_ANSI__ $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/hpux-cc/qmake.conf b/mkspecs/hpux-cc/qmake.conf
index 56e9057..d522252 100644
--- a/mkspecs/hpux-cc/qmake.conf
+++ b/mkspecs/hpux-cc/qmake.conf
@@ -30,25 +30,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -Ae +DA1.1e -w $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= +Z
 QMAKE_CFLAGS_YACC	=
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= +DA1.1e -w +a1 $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
 QMAKE_CXXFLAGS_YACC	= $$QMAKE_CFLAGS_YACC
diff --git a/mkspecs/hpux-g++/qmake.conf b/mkspecs/hpux-g++/qmake.conf
index 9ba5359..b11fde2 100644
--- a/mkspecs/hpux-g++/qmake.conf
+++ b/mkspecs/hpux-g++/qmake.conf
@@ -12,25 +12,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/hurd-g++/qmake.conf b/mkspecs/hurd-g++/qmake.conf
index 12d70f7..1898ea2 100644
--- a/mkspecs/hurd-g++/qmake.conf
+++ b/mkspecs/hurd-g++/qmake.conf
@@ -11,25 +11,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/irix-cc-64/qmake.conf b/mkspecs/irix-cc-64/qmake.conf
index 0113dac..cd6c432 100644
--- a/mkspecs/irix-cc-64/qmake.conf
+++ b/mkspecs/irix-cc-64/qmake.conf
@@ -40,25 +40,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -64 -woff 1021,1209,1233,1314,1355,1375,1506 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -fullwarn
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2 -OPT:Olimit=3000
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2 -OPT:Olimit=3000)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -woff 1110,1174,3262
 QMAKE_CFLAGS_THREAD	=
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= -64 -woff 1021,1209,1233,1314,1355,1375,1506,1681,1682,3496 $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/irix-cc-o32/qmake.conf b/mkspecs/irix-cc-o32/qmake.conf
index f512ec1..b755813 100644
--- a/mkspecs/irix-cc-o32/qmake.conf
+++ b/mkspecs/irix-cc-o32/qmake.conf
@@ -14,25 +14,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS		= -o32 -woff 3203,3260,3672 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -fullwarn
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2 -Olimit 3000
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2 -Olimit 3000)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -woff 3203,3262
 QMAKE_CFLAGS_THREAD	=
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/irix-cc/qmake.conf b/mkspecs/irix-cc/qmake.conf
index 2fef9df..e51731b 100644
--- a/mkspecs/irix-cc/qmake.conf
+++ b/mkspecs/irix-cc/qmake.conf
@@ -40,25 +40,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -n32 -woff 1021,1209,1233,1314,1355,1375,1506 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -fullwarn
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2 -OPT:Olimit=3000
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2 -OPT:Olimit=3000)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -woff 1110,1174,3262
 QMAKE_CFLAGS_THREAD	=
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= -n32 -woff 1021,1209,1233,1314,1355,1375,1506,1681,1682,3496 $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/irix-g++/qmake.conf b/mkspecs/irix-g++/qmake.conf
index 7def26a..38ee5d8 100644
--- a/mkspecs/irix-g++/qmake.conf
+++ b/mkspecs/irix-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	=
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/linux-cxx/qmake.conf b/mkspecs/linux-cxx/qmake.conf
index 28687c3..0f10c6a 100644
--- a/mkspecs/linux-cxx/qmake.conf
+++ b/mkspecs/linux-cxx/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= ccc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -w $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -Olimit 1000
 
 QMAKE_CXX		= cxx
 QMAKE_CXXFLAGS		= -w $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/linux-g++/qmake.conf b/mkspecs/linux-g++/qmake.conf
index 4507b37..dcc993a 100644
--- a/mkspecs/linux-g++/qmake.conf
+++ b/mkspecs/linux-g++/qmake.conf
@@ -9,25 +9,25 @@ TEMPLATE		= app
 CONFIG			+= qt warn_on release incremental
 QMAKE_INCREMENTAL_STYLE  = sublib
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/linux-icc/qmake.conf b/mkspecs/linux-icc/qmake.conf
index cd13562..f6b721d 100644
--- a/mkspecs/linux-icc/qmake.conf
+++ b/mkspecs/linux-icc/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= icc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= icpc
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/linux-kcc/qmake.conf b/mkspecs/linux-kcc/qmake.conf
index 17bf26a..47ad018 100644
--- a/mkspecs/linux-kcc/qmake.conf
+++ b/mkspecs/linux-kcc/qmake.conf
@@ -15,25 +15,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= KCC
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= --c --display_error_number --backend -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= +K2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), +K2)
 QMAKE_CFLAGS_DEBUG	= +K0
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= --diag_suppress 111,177
 QMAKE_CFLAGS_THREAD	= --thread_safe
 
 QMAKE_CXX		= KCC
 QMAKE_CXXFLAGS		= --display_error_number --diag_suppress 611,1142 --backend -pipe $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/linux-pgcc/qmake.conf b/mkspecs/linux-pgcc/qmake.conf
index ddccc47..e8161ae 100644
--- a/mkspecs/linux-pgcc/qmake.conf
+++ b/mkspecs/linux-pgcc/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= pgcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -fast
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -fast)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fpic
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= pgCC
 QMAKE_CXXFLAGS		= --display_error_number $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/macx-g++/qmake.conf b/mkspecs/macx-g++/qmake.conf
index 77c206c..dc8da5c 100644
--- a/mkspecs/macx-g++/qmake.conf
+++ b/mkspecs/macx-g++/qmake.conf
@@ -10,25 +10,25 @@ CONFIG			+= qt warn_on release resource_fork incremental global_init_link_order
 QMAKE_INCREMENTAL_STYLE = sublibs
 
 QMAKE_CC		= $(TB)cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_RESOURCE		= /Developer/Tools/Rez
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_EXTENSION_SHLIB	= dylib
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 
 QMAKE_CXX		= $(TB)c++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/macx-pbuilder/qmake.conf b/mkspecs/macx-pbuilder/qmake.conf
index b576719..6d765a8 100755
--- a/mkspecs/macx-pbuilder/qmake.conf
+++ b/mkspecs/macx-pbuilder/qmake.conf
@@ -9,25 +9,25 @@ TEMPLATE		= app
 CONFIG			+= qt warn_on release lib_version_first incremental resource_fork plugin_no_soname
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_RESOURCE		= /Developer/Tools/Rez
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O3
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O3)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_EXTENSION_SHLIB	= dylib
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 
 QMAKE_CXX		= c++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/netbsd-g++/qmake.conf b/mkspecs/netbsd-g++/qmake.conf
index 33264b3..fcabcaf 100644
--- a/mkspecs/netbsd-g++/qmake.conf
+++ b/mkspecs/netbsd-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -pthread
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/openbsd-g++/qmake.conf b/mkspecs/openbsd-g++/qmake.conf
index ea3bda9..9b929b1 100644
--- a/mkspecs/openbsd-g++/qmake.conf
+++ b/mkspecs/openbsd-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -pthread
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/qnx-g++/qmake.conf b/mkspecs/qnx-g++/qmake.conf
index 164dea6..b34eaba 100644
--- a/mkspecs/qnx-g++/qmake.conf
+++ b/mkspecs/qnx-g++/qmake.conf
@@ -10,25 +10,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe -fno-inline -fno-pack-struct $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses -fno-inline -fno-pack-struct
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/qws/freebsd-generic-g++/qmake.conf b/mkspecs/qws/freebsd-generic-g++/qmake.conf
index cb551a8..546166e 100644
--- a/mkspecs/qws/freebsd-generic-g++/qmake.conf
+++ b/mkspecs/qws/freebsd-generic-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2 -fno-default-inline
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2 -fno-default-inline)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -pthread -D_THREAD_SAFE
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS_DEPS     = $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQT_NO_QWS_LINUXFB -DQT_NO_QWS_TRANSFORMED -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/qws/linux-arm-g++/qmake.conf b/mkspecs/qws/linux-arm-g++/qmake.conf
index 30c58d3..8eabcb9 100644
--- a/mkspecs/qws/linux-arm-g++/qmake.conf
+++ b/mkspecs/qws/linux-arm-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= arm-linux-gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= arm-linux-g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/linux-generic-g++/qmake.conf b/mkspecs/qws/linux-generic-g++/qmake.conf
index 135c6f9..43f0d7f 100644
--- a/mkspecs/qws/linux-generic-g++/qmake.conf
+++ b/mkspecs/qws/linux-generic-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/linux-ipaq-g++/qmake.conf b/mkspecs/qws/linux-ipaq-g++/qmake.conf
index 7e4cbf5..c06e614 100644
--- a/mkspecs/qws/linux-ipaq-g++/qmake.conf
+++ b/mkspecs/qws/linux-ipaq-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= arm-linux-gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= arm-linux-g++ -DQT_QWS_IPAQ
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS  -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/linux-mips-g++/qmake.conf b/mkspecs/qws/linux-mips-g++/qmake.conf
index 55547dd..a34b651 100644
--- a/mkspecs/qws/linux-mips-g++/qmake.conf
+++ b/mkspecs/qws/linux-mips-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= mipsel-linux-gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= mipsel-linux-g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/linux-sharp-g++/qmake.conf b/mkspecs/qws/linux-sharp-g++/qmake.conf
index 11405c4..0c7ee7f 100644
--- a/mkspecs/qws/linux-sharp-g++/qmake.conf
+++ b/mkspecs/qws/linux-sharp-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= arm-linux-gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= arm-linux-g++ -DQT_QWS_SHARP -DQT_QWS_EBX
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS  -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/linux-x86-g++/qmake.conf b/mkspecs/qws/linux-x86-g++/qmake.conf
index e5ac6d1..dfc5e30 100644
--- a/mkspecs/qws/linux-x86-g++/qmake.conf
+++ b/mkspecs/qws/linux-x86-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS  -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/macx-generic-g++/qmake.conf b/mkspecs/qws/macx-generic-g++/qmake.conf
index e718d2b..aa6251f 100644
--- a/mkspecs/qws/macx-generic-g++/qmake.conf
+++ b/mkspecs/qws/macx-generic-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 QMAKE_EXTENSION_SHLIB	= dylib
 
 QMAKE_CC		= $(TB)cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2 -fno-default-inline
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2 -fno-default-inline)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= $(TB)c++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQT_NO_QWS_TRANSFORMED -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/qnx4-cc/qmake.conf b/mkspecs/qws/qnx4-cc/qmake.conf
index 1020a3e..ee4a9ec 100644
--- a/mkspecs/qws/qnx4-cc/qmake.conf
+++ b/mkspecs/qws/qnx4-cc/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release no_mocdepend
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -WC,-sg $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON    = -w1
 QMAKE_CFLAGS_WARN_OFF   = -w0
-QMAKE_CFLAGS_RELEASE    = -O
+QMAKE_CFLAGS_RELEASE    = $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g2d
 QMAKE_CFLAGS_SHLIB	= 
 QMAKE_CFLAGS_YACC	= 
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT -WC,-bm
 
 QMAKE_CXX		= cc
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQWS  $(CXXFLAGS_EXTRA)
 DEFINES			+= QT_NO_SOUND QT_CLEAN_NAMESPACE QT_NO_QWS_TRANSFORMED QT_NO_QWS_MOUSE_AUTO QT_NO_QWS_MOUSE_MANUAL QT_NO_QWS_LINUXFB
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/qws/qnx6-generic-cc/qmake.conf b/mkspecs/qws/qnx6-generic-cc/qmake.conf
index ef69f21..ae113fd 100644
--- a/mkspecs/qws/qnx6-generic-cc/qmake.conf
+++ b/mkspecs/qws/qnx6-generic-cc/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
  
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -Bstatic -fPIC -pipe -fno-inline -fno-pack-struct -fhonor-std -fno-builtins -fexceptions -D_STRINGS_H_INCLUDED $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= 
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses -fno-inline -fno-pack-struct
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
  
 QMAKE_CXX		= cc
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQWS -DQT_POSIX_QSHM -DQT_NO_SOUND -DQT_CLEAN_NAMESPACE -DQT_NO_QWS_TRANSFORMED -DQT_NO_QWS_MOUSE_AUTO -DQT_NO_QWS_MOUSE_MANUAL -DQT_NO_QWS_VFB -DQT_NO_QWS_LINUXFB -DQT_NO_QWS_MULTIPROCESS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/qnx6-generic-g++/qmake.conf b/mkspecs/qws/qnx6-generic-g++/qmake.conf
index df3c836..6961345 100644
--- a/mkspecs/qws/qnx6-generic-g++/qmake.conf
+++ b/mkspecs/qws/qnx6-generic-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
  
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe -fno-inline -fno-pack-struct -fhonor-std -fexceptions -D_STRINGS_H_INCLUDED $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses -fno-inline -fno-pack-struct
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
  
 QMAKE_CXX		= cc
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQWS -DQT_POSIX_QSHM -DQT_NO_QWS_MULTIPROCESS -DQT_NO_SOUND -DQT_CLEAN_NAMESPACE -DQT_NO_QWS_TRANSFORMED -DQT_NO_QWS_MOUSE_AUTO -DQT_NO_QWS_MOUSE_MANUAL -DQT_NO_PROCESS -DQT_NO_QWS_VFB -DQT_NO_QWS_LINUXFB $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/qws/solaris-generic-g++/qmake.conf b/mkspecs/qws/solaris-generic-g++/qmake.conf
index d6048bb..d286d5b 100644
--- a/mkspecs/qws/solaris-generic-g++/qmake.conf
+++ b/mkspecs/qws/solaris-generic-g++/qmake.conf
@@ -7,25 +7,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -pipe $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2 -fno-default-inline
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2 -fno-default-inline)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -DQT_NO_SOUND -DQT_NO_QWS_LINUXFB -DQT_NO_QWS_TRANSFORMED -DQWS -fno-exceptions -fno-rtti $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/reliant-cds-64/qmake.conf b/mkspecs/reliant-cds-64/qmake.conf
index fc7a3cf..c3ee3a8 100644
--- a/mkspecs/reliant-cds-64/qmake.conf
+++ b/mkspecs/reliant-cds-64/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -Klp64 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -v
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -K pthread
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/reliant-cds/qmake.conf b/mkspecs/reliant-cds/qmake.conf
index faaa26d..584bcf7 100644
--- a/mkspecs/reliant-cds/qmake.conf
+++ b/mkspecs/reliant-cds/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -v
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -K pthread
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/sco-cc/qmake.conf b/mkspecs/sco-cc/qmake.conf
index 54bcbfa..6c69a08 100644
--- a/mkspecs/sco-cc/qmake.conf
+++ b/mkspecs/sco-cc/qmake.conf
@@ -10,25 +10,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	= -Wf,--diag_suppress,111 -Wf,--diag_suppress,177
 QMAKE_CFLAGS_THREAD	= -Kthread
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -Wf,--display_error_number -Wf,--diag_suppress,838 $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE -Tused
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/sco-g++/qmake.conf b/mkspecs/sco-g++/qmake.conf
index 1c1e3c8..3044419 100644
--- a/mkspecs/sco-g++/qmake.conf
+++ b/mkspecs/sco-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/solaris-cc-64/qmake.conf b/mkspecs/solaris-cc-64/qmake.conf
index 33fda82..b30f3e8 100644
--- a/mkspecs/solaris-cc-64/qmake.conf
+++ b/mkspecs/solaris-cc-64/qmake.conf
@@ -26,25 +26,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -xarch=v9 -D_XOPEN_SOURCE=500 -D__EXTENSIONS__ $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -xM
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -mt
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= -O2
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/solaris-cc/qmake.conf b/mkspecs/solaris-cc/qmake.conf
index 3d50180..8b096fe 100644
--- a/mkspecs/solaris-cc/qmake.conf
+++ b/mkspecs/solaris-cc/qmake.conf
@@ -9,25 +9,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -xM
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_THREAD	= -mt
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= -O2
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/solaris-g++-64/qmake.conf b/mkspecs/solaris-g++-64/qmake.conf
index 622644b..da83d25 100644
--- a/mkspecs/solaris-g++-64/qmake.conf
+++ b/mkspecs/solaris-g++-64/qmake.conf
@@ -31,25 +31,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -m64 -D_XOPEN_SOURCE=500 -D__EXTENSIONS__ $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/solaris-g++/qmake.conf b/mkspecs/solaris-g++/qmake.conf
index 71f4307..2f3c752 100644
--- a/mkspecs/solaris-g++/qmake.conf
+++ b/mkspecs/solaris-g++/qmake.conf
@@ -14,25 +14,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/solaris-kcc/qmake.conf b/mkspecs/solaris-kcc/qmake.conf
index e1c3052..2c325e8 100644
--- a/mkspecs/solaris-kcc/qmake.conf
+++ b/mkspecs/solaris-kcc/qmake.conf
@@ -19,25 +19,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= KCC
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= --c --display_error_number $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= +K2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), +K2)
 QMAKE_CFLAGS_DEBUG	= +K0
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	= --diag_suppress 111,177
 QMAKE_CFLAGS_THREAD	= -mt
 
 QMAKE_CXX		= KCC
 QMAKE_CXXFLAGS		= --display_error_number --diag_suppress 611,1142 $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/tru64-cxx/qmake.conf b/mkspecs/tru64-cxx/qmake.conf
index 41279b4..be67cf3 100644
--- a/mkspecs/tru64-cxx/qmake.conf
+++ b/mkspecs/tru64-cxx/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cxx
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -Olimit 1000
 QMAKE_CFLAGS_THREAD	= -pthread
 
 QMAKE_CXX		= cxx
 QMAKE_CXXFLAGS		= -x cxx $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/tru64-g++/qmake.conf b/mkspecs/tru64-g++/qmake.conf
index ad2c06e..c71b0ae 100644
--- a/mkspecs/tru64-g++/qmake.conf
+++ b/mkspecs/tru64-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	= -D_REENTRANT
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/ultrix-g++/qmake.conf b/mkspecs/ultrix-g++/qmake.conf
index 2b847cb..347c543 100644
--- a/mkspecs/ultrix-g++/qmake.conf
+++ b/mkspecs/ultrix-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	=
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/unixware-cc/qmake.conf b/mkspecs/unixware-cc/qmake.conf
index 46b4657..e2e73fe 100644
--- a/mkspecs/unixware-cc/qmake.conf
+++ b/mkspecs/unixware-cc/qmake.conf
@@ -10,25 +10,25 @@
 MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= cc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -KPIC
 QMAKE_CFLAGS_YACC	= -Wf,--diag_suppress,111 -Wf,--diag_suppress,177
 QMAKE_CFLAGS_THREAD	= -Kthread
 
 QMAKE_CXX		= CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS -Wf,--display_error_number -Wf,--diag_suppress,838 $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE -Tused
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_SHLIB	= $$QMAKE_CFLAGS_SHLIB
diff --git a/mkspecs/unixware-g++/qmake.conf b/mkspecs/unixware-g++/qmake.conf
index 2ff9d3a..93ad257 100644
--- a/mkspecs/unixware-g++/qmake.conf
+++ b/mkspecs/unixware-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= yacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	= -Wall -W
 QMAKE_CFLAGS_WARN_OFF	= -w
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_SHLIB	= -fPIC
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 QMAKE_CFLAGS_THREAD	=
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
diff --git a/mkspecs/win32-borland/qmake.conf b/mkspecs/win32-borland/qmake.conf
index c7b8229..a6339b9 100644
--- a/mkspecs/win32-borland/qmake.conf
+++ b/mkspecs/win32-borland/qmake.conf
@@ -13,25 +13,25 @@ QMAKE_NOFORCE		= 1
 exists( $(QTDIR)\.qtwinconfig ) {
 	include( $(QTDIR)\.qtwinconfig )
 }
 
 QMAKE_CC		= bcc32
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= byacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -tWR $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -w -w-hid
 QMAKE_CFLAGS_WARN_OFF	= -w-
-QMAKE_CFLAGS_RELEASE	= -O2
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O2)
 QMAKE_CFLAGS_DEBUG	= -v
 QMAKE_CFLAGS_MT		= -tWM
 QMAKE_CFLAGS_MT_DBG	= -tWM
 QMAKE_CFLAGS_MT_DLL	= -tWM
 QMAKE_CFLAGS_MT_DLLDBG	= -tWM
 QMAKE_CFLAGS_YACC	=
 QMAKE_CFLAGS_CONSOLE	= -tWC
 
 !contains(CONFIG,exceptions){
 	QMAKE_CFLAGS += -x-
 }
 !contains(CONFIG,rtti){
diff --git a/mkspecs/win32-g++/qmake.conf b/mkspecs/win32-g++/qmake.conf
index 8a24c43..2410e34 100644
--- a/mkspecs/win32-g++/qmake.conf
+++ b/mkspecs/win32-g++/qmake.conf
@@ -8,25 +8,25 @@ MAKEFILE_GENERATOR	= UNIX
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= gcc
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= byacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -fvtable-thunks $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_DEPS	= -M
 QMAKE_CFLAGS_WARN_ON	=
 QMAKE_CFLAGS_WARN_OFF	=
-QMAKE_CFLAGS_RELEASE	= -O
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O)
 QMAKE_CFLAGS_DEBUG	= -g
 QMAKE_CFLAGS_YACC	= -Wno-unused -Wno-parentheses
 
 QMAKE_CXX		= g++
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_DEPS	= $$QMAKE_CFLAGS_DEPS
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_YACC	= $$QMAKE_CFLAGS_YACC
 
diff --git a/mkspecs/win32-icc/qmake.conf b/mkspecs/win32-icc/qmake.conf
index b5476a0..0a7d113 100644
--- a/mkspecs/win32-icc/qmake.conf
+++ b/mkspecs/win32-icc/qmake.conf
@@ -12,25 +12,25 @@ DEFINES			+= UNICODE
 exists( $(QTDIR)\.qtwinconfig ) {
 	include( $(QTDIR)\.qtwinconfig )
 }
 
 QMAKE_CC		= icl
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= byacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -nologo -Zm200 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -W3
 QMAKE_CFLAGS_WARN_OFF	= -W0
-QMAKE_CFLAGS_RELEASE	= -Od -Ob1s
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -Od -Ob1s)
 QMAKE_CFLAGS_DEBUG	= -Zi
 QMAKE_CFLAGS_MT		= -MD
 QMAKE_CFLAGS_MT_DBG	= -MDd
 QMAKE_CFLAGS_MT_DLL	= -MD
 QMAKE_CFLAGS_MT_DLLDBG	= -MDd
 QMAKE_CFLAGS_YACC	=
 
 contains(CONFIG,stl){
 	QMAKE_CFLAGS	+= -GX $(CFLAGS_EXTRA)
 }
 contains(CONFIG,exceptions){
 	QMAKE_CFLAGS += -GX
diff --git a/mkspecs/win32-msvc.net/qmake.conf b/mkspecs/win32-msvc.net/qmake.conf
index d75a251..6c4185f 100644
--- a/mkspecs/win32-msvc.net/qmake.conf
+++ b/mkspecs/win32-msvc.net/qmake.conf
@@ -12,25 +12,25 @@ DEFINES			+= UNICODE WIN32 NDEBUG
 exists( $(QTDIR)\.qtwinconfig ) {
 	include( $(QTDIR)\.qtwinconfig )
 }
 
 QMAKE_CC		= cl
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		=
 QMAKE_YACC		= byacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -nologo -Zm200 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -W3
 QMAKE_CFLAGS_WARN_OFF	= -W0
-QMAKE_CFLAGS_RELEASE	= -O1
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O1)
 QMAKE_CFLAGS_DEBUG	= -Z7
 QMAKE_CFLAGS_MT		= -MD
 QMAKE_CFLAGS_MT_DBG	= -MD
 QMAKE_CFLAGS_MT_DLL	= -MD
 QMAKE_CFLAGS_MT_DLLDBG	= -MD
 QMAKE_CFLAGS_ST		= -ML
 QMAKE_CFLAGS_ST_DBG	= -MLd
 QMAKE_CFLAGS_YACC	=
 
 contains(CONFIG,stl){
 	QMAKE_CFLAGS	+= -GX $(CFLAGS_EXTRA)
 }
diff --git a/mkspecs/win32-msvc/qmake.conf b/mkspecs/win32-msvc/qmake.conf
index f3be273..3a6e650 100644
--- a/mkspecs/win32-msvc/qmake.conf
+++ b/mkspecs/win32-msvc/qmake.conf
@@ -12,25 +12,25 @@ DEFINES			+= UNICODE
 exists( $(QTDIR)\.qtwinconfig ) {
 	include( $(QTDIR)\.qtwinconfig )
 }
 
 QMAKE_CC		= cl
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= byacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -nologo -Zm200 $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -W3
 QMAKE_CFLAGS_WARN_OFF	= -W0
-QMAKE_CFLAGS_RELEASE	= -O1
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -O1)
 QMAKE_CFLAGS_DEBUG	= -Zi
 QMAKE_CFLAGS_MT		= -MD
 QMAKE_CFLAGS_MT_DBG	= -MDd
 QMAKE_CFLAGS_MT_DLL	= -MD
 QMAKE_CFLAGS_MT_DLLDBG	= -MDd
 QMAKE_CFLAGS_YACC	=
 
 contains(CONFIG,stl){
 	QMAKE_CFLAGS	+= -GX $(CFLAGS_EXTRA)
 }
 contains(CONFIG,exceptions){
 	QMAKE_CFLAGS += -GX
diff --git a/mkspecs/win32-visage/qmake.conf b/mkspecs/win32-visage/qmake.conf
index aa8e598..87b3b8f 100644
--- a/mkspecs/win32-visage/qmake.conf
+++ b/mkspecs/win32-visage/qmake.conf
@@ -6,25 +6,25 @@
 
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= icc -C
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= byacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -Q -Ft -Gd -Gm+ -qrtti=all $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -W3
 QMAKE_CFLAGS_WARN_OFF	= -W0
-QMAKE_CFLAGS_RELEASE	= -Gl+ -O -Oc+
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -Gl+ -O -Oc+)
 QMAKE_CFLAGS_DEBUG	= -Fb* -Ti -Tm
 QMAKE_CFLAGS_YACC	=
 
 QMAKE_CXX		= $$QMAKE_CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_YACC	= $$QMAKE_CFLAGS_YACC
 
 QMAKE_INCDIR		=
diff --git a/mkspecs/win32-watcom/qmake.conf b/mkspecs/win32-watcom/qmake.conf
index dd3a71d..1c4760f 100644
--- a/mkspecs/win32-watcom/qmake.conf
+++ b/mkspecs/win32-watcom/qmake.conf
@@ -6,25 +6,25 @@
 
 TEMPLATE		= app
 CONFIG			+= qt warn_on release
 
 QMAKE_CC		= wcl386
 QMAKE_LEX		= flex
 QMAKE_LEXFLAGS		= 
 QMAKE_YACC		= byacc
 QMAKE_YACCFLAGS		= -d
 QMAKE_CFLAGS		= -zq $(CFLAGS_EXTRA)
 QMAKE_CFLAGS_WARN_ON	= -w2
 QMAKE_CFLAGS_WARN_OFF	= -w0
-QMAKE_CFLAGS_RELEASE	= -ox
+QMAKE_CFLAGS_RELEASE	= $(if $(CFLAGS_RELEASE),$(CFLAGS_RELEASE), -ox)
 QMAKE_CFLAGS_DEBUG	= -d2
 QMAKE_CFLAGS_YACC	=
 
 QMAKE_CXX		= $$QMAKE_CC
 QMAKE_CXXFLAGS		= $$QMAKE_CFLAGS $(CXXFLAGS_EXTRA)
 QMAKE_CXXFLAGS_WARN_ON	= $$QMAKE_CFLAGS_WARN_ON
 QMAKE_CXXFLAGS_WARN_OFF	= $$QMAKE_CFLAGS_WARN_OFF
 QMAKE_CXXFLAGS_RELEASE	= $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG	= $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_YACC	= $$QMAKE_CFLAGS_YACC
 
 QMAKE_INCDIR		=