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-rw-r--r--src/engine/SCons/Defaults.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/engine/SCons/Defaults.py b/src/engine/SCons/Defaults.py
index 7d44e38..a3acc52 100644
--- a/src/engine/SCons/Defaults.py
+++ b/src/engine/SCons/Defaults.py
@@ -273,7 +273,7 @@ def _concat(prefix, list, suffix, env, f=lambda x: x, target=None, source=None):
return list
l = f(SCons.PathList.PathList(list).subst_path(env, target, source))
- if not l is None:
+ if l is not None:
list = l
return _concat_ixes(prefix, list, suffix, env)