1 files changed, 8 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 23fdd53..6a47ed2 100644
--- a/Makefile
+++ b/Makefile
@@ -18,2 +18,7 @@ INSTALL = install
 #
+# Define NO_C99_FORMAT if your formatted IO functions (printf/scanf et.al.)
+# do not support the 'size specifiers' introduced by C99, namely ll, hh,
+# j, z, t. (representing long long int, char, intmax_t, size_t, ptrdiff_t).
+# some C compilers supported these specifiers prior to C99 as an extension.
+#
 
@@ -129,2 +134,5 @@ ifdef NO_STRCASESTR
 endif
+ifdef NO_C99_FORMAT
+        CFLAGS += -DNO_C99_FORMAT
+endif
 ifdef NO_OPENSSL