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-rw-r--r--md5/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/md5/configure.ac b/md5/configure.ac
index 1e03525..0f53ceb 100644
--- a/md5/configure.ac
+++ b/md5/configure.ac
@@ -20,6 +20,7 @@ AC_PROG_AWK
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_LIBTOOL
if test "$GCC" = yes