From 214042a170c860523b7aad2a251b0dbfbaefb235 Mon Sep 17 00:00:00 2001
From: fanquake <fanquake@gmail.com>
Date: Tue, 23 Nov 2021 11:24:12 +0800
Subject: [PATCH] build: don't append valgrind CPPFLAGS if not installed

---
 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 48705c9671..2a762488fe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,8 +43,8 @@ case $host_os in
          # These Homebrew packages may be keg-only, meaning that they won't be found
          # in expected paths because they may conflict with system files. Ask
          # Homebrew where each one is located, then adjust paths accordingly.
-         valgrind_prefix=`$BREW --prefix valgrind 2>/dev/null`
-         if test x$valgrind_prefix != x; then
+         if $BREW list --versions valgrind >/dev/null; then
+           valgrind_prefix=`$BREW --prefix valgrind 2>/dev/null`
            VALGRIND_CPPFLAGS="-I$valgrind_prefix/include"
          fi
        else