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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 761686e..a47e0c7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,6 +5,7 @@ AC_CONFIG_MACRO_DIR([m4])
AM_INIT_AUTOMAKE([foreign subdir-objects dist-xz])
AM_SILENT_RULES([yes])
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_INSTALL
AC_PROG_RANLIB
AC_PROG_MKDIR_P