use standard autoconf variables

diff --git a/acinclude.m4 b/acinclude.m4
index 12c4c6e2ba3134ddc624784dcf220867ba00024d..e116f9542de978eb579daf872970b2bb63706ab2 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -9,15 +9,7 @@ dnl
 AC_DEFUN(AC_CHECK_CC_OPTION,[
   echo "main(){return 0;}" > conftest.$ac_ext
   opt="$1"
-  if echo '\c' | grep -s c >/dev/null 2>&1
-  then
-    echo_n="-n"
-    echo_c=""
-  else
-    echo_n=""
-    echo_c='\c'
-  fi
-  var=`echo $echo_n "$opt$echo_c"|tr -c a-zA-Z0-9 _`
+  var=`echo $ac_n "$opt$ac_c"|tr -c a-zA-Z0-9 _`
   AC_MSG_CHECKING([if compiler supports -$1 really])
   ac_compile="${CC-cc} -$opt -c $CFLAGS $CPPFLAGS conftest.$ac_ext 2>&1"
   if eval $ac_compile | egrep "$opt" > /dev/null 2>&1 ; then