From 9d8cda7ccacd197fd1d69c605e1a92c3ccaa547f Mon Sep 17 00:00:00 2001
From: Larry Gritz <lg@larrygritz.com>
Date: Wed, 30 Dec 2020 21:46:15 -0800
Subject: [PATCH] Avoid stray pyconfig.h definition of 'copysign' causing
 problems (#2800)

Caused build errors on Windows due to conflicting definitions of copysign (one of which was a macro).
---
 src/python/py_oiio.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/python/py_oiio.h b/src/python/py_oiio.h
index a2af73f2c8..75cd66ec13 100644
--- a/src/python/py_oiio.h
+++ b/src/python/py_oiio.h
@@ -24,6 +24,11 @@
 // Avoid a compiler warning from a duplication in tiffconf.h/pyconfig.h
 #undef SIZEOF_LONG
 
+// Avoid a problem with copysign defined in pyconfig.h on Windows.
+#ifdef copysign
+#    undef copysign
+#endif
+
 #include <OpenImageIO/deepdata.h>
 #include <OpenImageIO/imagebuf.h>
 #include <OpenImageIO/imagecache.h>