diff -up src/setup.py.orig src/setup.py --- src/setup.py.orig 2019-10-03 16:02:47.728642827 -0300 +++ src/setup.py 2019-10-03 16:03:22.041859763 -0300 @@ -335,6 +335,9 @@ class sage_build_cython(Command): with open(self._version_file, 'w') as f: f.write(self._version_stamp) + # Remove buildroot paths from the generated files + subprocess.run(["find", "build/cythonized/sage", "-type", "f", "-exec", "sed", "-i", "s|@@BUILDROOT@@||g", "{}", "+"], check=True) + # Finally, copy relevant cythonized files from build/cythonized # tree into the build-lib tree for (dst_dir, src_files) in self.get_cythonized_package_files():