--- SConstruct.old	2019-10-06 07:53:31.000000000 +0200
+++ SConstruct	2019-10-07 02:34:28.000000000 +0200
@@ -268,6 +268,10 @@ if sys.platform != 'win32':
   if sys.platform == 'sunos5':
     env.Append(LIBS=['m'])
     env.Append(PLATFORM='posix')
+
+  if sys.platform.startswith('darwin'):
+    if 'DEVELOPER_DIR' in os.environ:
+      env['ENV']['DEVELOPER_DIR'] = os.environ['DEVELOPER_DIR']
 else:
   # Warning level 4, no unused argument warnings
   env.Append(CCFLAGS=['/W4', '/wd4100'])