don't support all extras

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

pipenv/patched/piptools/repositories/pypi.py

@@ -224,9 +224,9 @@ class PyPIRepository(BaseRepository):
                 for section in setup_requires:
                     python_version = section
                     for value in setup_requires[section]:
-                        if ':' in value:
+                        if ':' in value and 'python' in value:
                             python_version = value[1:-1]
-                        else:
+                        elif ':' not in value:
                             try:
                                 result = result + [InstallRequirement.from_line("{0}{1}".format(value, python_version).replace(':', ';'))]
                             # Anything could go wrong here — can't be too careful.

tests/test_pipenv.py

@@ -946,6 +946,7 @@ requests = "==2.14.0"
     @pytest.mark.install
     @pytest.mark.files
     @pytest.mark.resolver
+    @pytest.mark.eggs
     def test_local_package(self, pip_src_dir):
         """This test ensures that local packages (directories with a setup.py)
         installed in editable mode have their dependencies resolved as well"""