From 462804da9ce5a2ffc8c6ad4887d97116cf868d13 Mon Sep 17 00:00:00 2001
From: Ken Brown <kbrown@cornell.edu>
Date: Sat, 12 Nov 2016 21:45:24 -0500
Subject: [PATCH] Unbreak the build on Cygwin

* configure.ac (system_malloc) [CYGWIN]: Unset.
---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 7450e2f7274..d9f52e5b8ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2157,7 +2157,8 @@ system_malloc=yes
 case "$opsys" in
   ## darwin ld insists on the use of malloc routines in the System framework.
   darwin | mingw32 | nacl | sol2-10) ;;
-  cygwin) hybrid_malloc=yes;;
+  cygwin) hybrid_malloc=yes
+          system_malloc= ;;
   *) test "$ac_cv_func_sbrk" = yes && system_malloc=$emacs_cv_sanitize_address;;
 esac
 
-- 
2.39.5