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-rw-r--r--rfc2045/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/rfc2045/configure.ac b/rfc2045/configure.ac
index 2957ed2..27c5deb 100644
--- a/rfc2045/configure.ac
+++ b/rfc2045/configure.ac
@@ -13,6 +13,7 @@ AC_CONFIG_HEADERS(rfc2045_config.h)
dnl Checks for programs.
AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_CXX
AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL