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-rw-r--r--numpy/distutils/environment.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/numpy/distutils/environment.py b/numpy/distutils/environment.py
index 78fe15f20..01b5f9b7d 100644
--- a/numpy/distutils/environment.py
+++ b/numpy/distutils/environment.py
@@ -55,6 +55,8 @@ class EnvironmentConfig(object):
envvar_contents = os.environ.get(envvar)
if envvar_contents is not None:
if append and os.environ.get('NPY_DISTUTILS_APPEND_FLAGS', '1') == '1':
+ if var is None:
+ var = ''
try:
var = ' '.join(var + [envvar_contents])
except TypeError: