From 7188a4c7b142c92287b025b55753959a33a2901e Mon Sep 17 00:00:00 2001
From: "Steven G. Johnson" <stevenj@mit.edu>
Date: Wed, 9 Feb 2022 10:11:03 -0500
Subject: [PATCH] updated test for whether CFLAGS was set by the user (#271)

---
 m4/ax_cc_maxopt.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/m4/ax_cc_maxopt.m4 b/m4/ax_cc_maxopt.m4
index 61d3a985c..ca514bdf5 100644
--- a/m4/ax_cc_maxopt.m4
+++ b/m4/ax_cc_maxopt.m4
@@ -26,7 +26,7 @@ AC_REQUIRE([AX_COMPILER_VENDOR])
 AC_REQUIRE([AC_CANONICAL_HOST])
 
 # Try to determine "good" native compiler flags if none specified via CFLAGS
-if test "$ac_test_CFLAGS" != "set"; then
+if test "x$ac_test_CFLAGS" != "xset" -a "x$ac_test_CFLAGS" != "xy"; then
   CFLAGS=""
   case $ax_cv_c_compiler_vendor in
     dec) CFLAGS="-newc -w0 -O5 -ansi_alias -ansi_args -fp_reorder -tune host"