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-rw-r--r--gpglib/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/gpglib/configure.ac b/gpglib/configure.ac
index e904831..441d3fb 100644
--- a/gpglib/configure.ac
+++ b/gpglib/configure.ac
@@ -19,6 +19,7 @@ dnl Checks for programs.
AC_PROG_AWK
AC_PROG_INSTALL
AC_PROG_CC
+AC_PROG_CC_C99
AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL
AC_PROG_LN_S