From bd4ed77f73d37df325fc8f1e193b3ce6bc08094d Mon Sep 17 00:00:00 2001
From: Stefan Krah <skrah@bytereef.org>
Date: Wed, 6 Dec 2017 18:24:17 +0100
Subject: [PATCH] bpo-32233: Fix build with --with-system-libmpdec. (#4739)

---
 setup.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index c22de17f953..09e35e50609 100644
--- a/setup.py
+++ b/setup.py
@@ -2069,6 +2069,7 @@ class PyBuildExt(build_ext):
                                                          'Modules',
                                                          '_decimal',
                                                          'libmpdec'))]
+            libraries = ['m']
             sources = [
               '_decimal/_decimal.c',
               '_decimal/libmpdec/basearith.c',
@@ -2164,7 +2165,7 @@ class PyBuildExt(build_ext):
         ext = Extension (
             '_decimal',
             include_dirs=include_dirs,
-            libraries=['m'],
+            libraries=libraries,
             define_macros=define_macros,
             undef_macros=undef_macros,
             extra_compile_args=extra_compile_args,