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From f306234fbaa6bd3fbcb75ebe5e3b318a9fc1c5f0 Mon Sep 17 00:00:00 2001
From: James Le Cuirot <chewi@gentoo.org>
Date: Sat, 25 Apr 2020 11:40:18 +0100
Subject: [PATCH] Don't use auto CFLAGS/LDFLAGS if they are set but blank

Explicitly blank flags are valid.
---
 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index f8ba989..330959c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,12 +82,12 @@ case "$build" in
 esac
 AC_SUBST([CONF_BUILD],[$ac_build])
 
-if test -z "$CFLAGS" ; then
+if test -z "${CFLAGS+set}" ; then
 	ac_auto_cflags=yes
 else
 	ac_auto_cflags=no
 fi
-if test -z "$LDFLAGS" ; then
+if test -z "${LDFLAGS+set}" ; then
 	ac_auto_ldflags=yes
 else
 	ac_auto_ldflags=no
-- 
2.26.0