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-rw-r--r--configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 65926453b..494877381 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,7 @@ LT_INIT
# Checks for programs.
AC_PROG_CC
+AC_PROG_CC_C99
CFLAGS="-Wall $CFLAGS"