diff -ruN OpenColorIO-1.0.9-orig/export/OpenColorIO/OpenColorIO.h OpenColorIO-1.0.9/export/OpenColorIO/OpenColorIO.h
--- OpenColorIO-1.0.9-orig/export/OpenColorIO/OpenColorIO.h	2013-10-08 17:59:34.000000000 -0500
+++ OpenColorIO-1.0.9/export/OpenColorIO/OpenColorIO.h	2015-01-19 09:11:46.000000000 -0600
@@ -34,6 +34,7 @@
 #include <iosfwd>
 #include <string>
 #include <cstddef>
+#include <unistd.h>
 
 #include "OpenColorABI.h"
 #include "OpenColorTypes.h"
diff -ruN OpenColorIO-1.1.1-orig/CMakeLists.txt OpenColorIO-1.1.1/CMakeLists.txt
--- OpenColorIO-1.1.1-orig/CMakeLists.txt	2019-03-28 00:12:57.000000000 -0500
+++ OpenColorIO-1.1.1/CMakeLists.txt	2020-02-24 05:09:50.000000000 -0600
@@ -36,7 +36,7 @@
 option(OCIO_PYGLUE_SONAME "If ON, soname/soversion will be set for Python module library" OFF)
 option(OCIO_PYGLUE_LIB_PREFIX "If ON, prefix the Python module with 'lib'" OFF)
 
-if(UNIX AND NOT APPLE)
+if(UNIX)
     option(USE_EXTERNAL_YAML "Use system installed yaml-cpp library." OFF)
     option(USE_EXTERNAL_TINYXML "Use system installed tinyxml library." OFF)
     option(USE_EXTERNAL_LCMS "Use system install lcms2 library." OFF)