configure.ac: Do not use AC_PROG_CC_STDC anymore

On Ubuntu 22.04 LTS, this resolves:

> configure.ac:100: warning: The macro `AC_PROG_CC_STDC' is obsolete.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/configure.ac b/configure.ac
index 2289e7d9c648d91ab4f1b5abb0e07bced22dbc5e..ada66edde4f2fb46dab158d2074313bb099b5247 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@
 #                                                                             #
 ###############################################################################
 
-AC_PREREQ([2.64])
+AC_PREREQ([2.71])
 
 AC_INIT([pakfire],
        [0.9.27],
@@ -97,7 +97,7 @@ PKG_PROG_PKG_CONFIG
 m4_pattern_forbid([^_?PKG_[A-Z_]+$],[*** pkg.m4 missing, please install pkg-config])
 
 # C Compiler
-AC_PROG_CC_STDC
+AC_PROG_CC
 
 CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
        -Wall \