From 079a7495f279080b6745ea4fceb5a313aca3d4b8 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Tue, 31 Jul 2018 10:47:16 +0200
Subject: [PATCH] Fix macOS build by providing missing std::copysign

---
 dtool/src/dtoolbase/dtoolbase_cc.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dtool/src/dtoolbase/dtoolbase_cc.h b/dtool/src/dtoolbase/dtoolbase_cc.h
index 3af3c9c250..ff52c6291a 100644
--- a/dtool/src/dtoolbase/dtoolbase_cc.h
+++ b/dtool/src/dtoolbase/dtoolbase_cc.h
@@ -97,10 +97,12 @@ typedef std::ios::seekdir ios_seekdir;
 // in some important missing functions.
 #if defined(__GLIBCXX__) && __GLIBCXX__ <= 20070719
 #include <tr1/tuple>
+#include <tr1/cmath>
 
 namespace std {
   using std::tr1::tuple;
   using std::tr1::tie;
+  using std::tr1::copysign;
 
   typedef decltype(nullptr) nullptr_t;