Merge pull request #3095 from agronholm/pep-517

Allow installation of the project without a setup.py

Author: ericholscher

readthedocs/doc_builder/python_environments.py

@@ -48,8 +48,7 @@ def delete_existing_build_dir(self):
             shutil.rmtree(build_dir)
 
     def install_package(self):
-        setup_path = os.path.join(self.checkout_path, 'setup.py')
-        if os.path.isfile(setup_path) and self.config.install_project:
+        if self.config.install_project:
             if self.config.pip_install or getattr(settings, 'USE_PIP_INSTALL', False):
                 extra_req_param = ''
                 if self.config.extra_requirements: