Use $GCC instead of undocumented autoconf internal $ac_cv_c_compiler_gnu

diff --git a/configure.ac b/configure.ac
index c5f44c1..baf8c15 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -24,7 +24,7 @@ AC_PROG_YACC
 
 AS=${AS-as}
 AC_SUBST(AS)
-if test "$ac_cv_c_compiler_gnu" = yes; then
+if test "$GCC" = yes; then
     CFLAGS="$CFLAGS -fPIC -DPIC -D_GNU_SOURCE -D_REENTRANT -Wall -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wno-char-subscripts"
     cflags_to_try="-fno-strict-aliasing"
     AC_MSG_CHECKING([supported compiler flags])