.

setup.py

@@ -28,6 +28,7 @@ from subprocess import Popen, PIPE
 
 import os
 import sys
+from errno import EEXIST
 
 
 # tell cython to resolve `cimport wendelin.*` modules hierarchy starting at top-level.
@@ -187,8 +188,13 @@ class build_ext(_build_ext):
 
         # copy wcfs/wcfs built from wcfs.go by make into build/lib.linux-x86_64-2.7/...
         # so that py packaging tools see built wcfs.go as part of wendelin/wcfs package.
-        copy_file('wcfs/wcfs', os.path.join(self.build_lib, 'wendelin/wcfs/wcfs'),
-            verbose=self.verbose, dry_run=self.dry_run)
+        dst = os.path.join(self.build_lib, 'wendelin/wcfs')
+        try:
+            os.makedirs(dst)
+        except OSError as e:
+            if e.errno != EEXIST:
+                raise
+        copy_file('wcfs/wcfs', dst, verbose=self.verbose, dry_run=self.dry_run)