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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 ad20b5fd..11011e7c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,6 +23,7 @@ SAVED_LDFLAGS="$LDFLAGS"
# Set up the compiler in two different ways and say yes we may want to install.
AC_PROG_CC
AM_PROG_CC_C_O
+AC_PROG_CC_C99
AC_PROG_CPP
AC_PROG_EGREP
AC_PROG_INSTALL