Use a version number of 0.0.0 instead of ???. The latter leads to

theller · theller · commit b667da7ae552 · 2001-12-06T20:44:19.000Z
invalid filenames on Windows when building without specifying a version number in the setup script. See also http://mail.python.org/pipermail/distutils-sig/2001-November/002656.html Bugfix candidate. git-svn-id: http://svn.python.org/projects/python/trunk@24578 6015fed2-1504-0410-9fe1-9d1591cc4771
diff --git a/Lib/distutils/dist.py b/Lib/distutils/dist.py
@@ -1012,7 +1012,7 @@ def get_name (self):
         return self.name or "UNKNOWN"
 
     def get_version(self):
-        return self.version or "???"
+        return self.version or "0.0.0"
 
     def get_fullname (self):
         return "%s-%s" % (self.get_name(), self.get_version())
