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-rw-r--r--liblock/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/liblock/configure.ac b/liblock/configure.ac
index f2f205e..728ef1e 100644
--- a/liblock/configure.ac
+++ b/liblock/configure.ac
@@ -17,6 +17,7 @@ CFLAGS="-I.. -I${srcdir}/.. $CFLAGS"
dnl Checks for programs.
AC_PROG_AWK
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_LIBTOOL