try to escape the versioneer stuff

nix/nevow.nix

@@ -2,7 +2,7 @@
 
 buildPythonPackage rec {
   pname = "Nevow";
-  version = "0.15.0";
+  version = "0.14.4.dev";
   name = "${pname}-${version}";
   disabled = isPy3k;
 
@@ -15,6 +15,8 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ twisted ];
 
+  patches = [ ./nevow.patch ];
+
   checkInputs = [ twisted ];
 
   checkPhase = ''

nix/nevow.patch

@@ -0,0 +1,14 @@
+diff --git a/setup.py b/setup.py
+index b28f09a..140a03f 100644
+--- a/setup.py
++++ b/setup.py
+@@ -21,8 +21,7 @@ for (dirpath, dirnames, filenames) in os.walk("doc"):
+ if __name__ == '__main__':
+     setup(
+         name='Nevow',
+-        version=versioneer.get_version(),
+-        cmdclass=versioneer.get_cmdclass(),
++        version="0.14.4",
+         packages=find_packages(),
+         py_modules=["twisted.plugins.nevow_widget"],
+         include_package_data=True,