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-rw-r--r--numlib/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/numlib/configure.ac b/numlib/configure.ac
index 0f2319d..5f012e4 100644
--- a/numlib/configure.ac
+++ b/numlib/configure.ac
@@ -16,6 +16,7 @@ AM_INIT_AUTOMAKE([foreign no-define])
dnl Checks for programs.
AC_PROG_AWK
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_LIBTOOL