commit:     05aa21138340e1e47fdc1221fe28f91c56069efd
Author:     Mike Frysinger <vapier <AT> gentoo <DOT> org>
AuthorDate: Sat Nov  6 01:00:57 2021 +0000
Commit:     Mike Frysinger <vapier <AT> gentoo <DOT> org>
CommitDate: Sat Nov  6 01:00:57 2021 +0000
URL:        https://gitweb.gentoo.org/proj/sandbox.git/commit/?id=05aa2113

build: require at least a C99 compiler

Realistically we aren't even testing with older than C11 compilers,
but one thing at a time.

Signed-off-by: Mike Frysinger <vapier <AT> gentoo.org>

 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index a353e0a..56ca87f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,7 +20,8 @@ env 1>&AS_MESSAGE_LOG_FD
 AC_MSG_RESULT([ok])
 
 dnl Check for compiler and features first.
-AC_PROG_CC
+AC_PROG_CC_C99
+AS_IF([test "$ac_cv_prog_cc_c99" = "no"], [AC_MSG_ERROR([A C99+ compiler is 
required])])
 AM_PROG_CC_C_O
 AC_ISC_POSIX
 AC_USE_SYSTEM_EXTENSIONS

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