Remove environment variable to set gcc5.

import os, errno

import versioneer

os.environ["CC"] = "gcc-5"

os.environ["CXX"] = "g++-5"

ext = Extension(name='prrt', language="c", sources=["prrt/*.pyx"])

try:

    os.remove(os.path.join(os.path.dirname(os.path.realpath(__file__)), "prrt/prrt.c"))