python.pkgs.nipype: Futures is python 2 only. Also fix building.

pkgs/development/python-modules/nipype/default.nix

@@ -18,6 +18,8 @@
 , psutil
 , pydot
 , pytest
+, pytest_xdist
+, pytest-forked
 , scipy
 , simplejson
 , traits
@@ -47,8 +49,6 @@ buildPythonPackage rec {
   postPatch = ''
     substituteInPlace nipype/interfaces/base/tests/test_core.py \
       --replace "/usr/bin/env bash" "${bash}/bin/bash"
-
-    rm pytest.ini
   '';
 
   propagatedBuildInputs = [
@@ -56,7 +56,6 @@ buildPythonPackage rec {
     dateutil
     funcsigs
     future
-    futures
     networkx
     nibabel
     numpy
@@ -70,9 +69,10 @@ buildPythonPackage rec {
     xvfbwrapper
   ] ++ stdenv.lib.optional (!isPy3k) [
     configparser
+    futures
   ];
 
-  checkInputs = [ pytest mock pytestcov codecov which glibcLocales ];
+  checkInputs = [ pytest mock pytestcov pytest_xdist pytest-forked codecov which glibcLocales ];
 
   checkPhase = ''
     LC_ALL="en_US.UTF-8" py.test -v --doctest-modules nipype