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diff --git a/setupext.py b/setupext.py
index 6d363012eb4..00ef3fe5a3d 100644
--- a/setupext.py
+++ b/setupext.py
@@ -162,8 +162,10 @@ def get_include_dirs():
"""
include_dirs = [os.path.join(d, 'include') for d in get_base_dirs()]
if sys.platform != 'win32':
- # gcc includes this dir automatically, so also look for headers in
+ # gcc includes these dirs automatically, so also look for headers in
# these dirs
+ include_dirs.extend(
+ os.environ.get('CPATH', '').split(os.pathsep))
include_dirs.extend(
os.environ.get('CPLUS_INCLUDE_PATH', '').split(os.pathsep))
return include_dirs
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