1 files changed, 4 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 685d213..463e636 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,13 @@
 #!/usr/bin/make -f
+ifndef QTDIR
+$(error QTDIR not set)
+endif
+
 export OPIEDIR:=$(shell pwd)
 export TOPDIR:=$(OPIEDIR)
 export QMAKE:=$(OPIEDIR)/qmake/qmake
 
 export QMAKESPECSDIR=$(OPIEDIR)/mkspecs
 
 noconfig_targets := xconfig menuconfig config oldconfig randconfig \
                     defconfig allyesconfig allnoconfig allmodconfig \