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-rw-r--r--sha1/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/sha1/configure.ac b/sha1/configure.ac
index 5d59beb..d424b26 100644
--- a/sha1/configure.ac
+++ b/sha1/configure.ac
@@ -17,6 +17,7 @@ AM_CONDITIONAL(HMACC, test -d ${srcdir}/../libhmac)
dnl Checks for programs.
AC_PROG_CC
+AC_PROG_CC_C99
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_LIBTOOL