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-rw-r--r--libhmac/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/libhmac/configure.ac b/libhmac/configure.ac
index a243f83..9427c3f 100644
--- a/libhmac/configure.ac
+++ b/libhmac/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