gistfile1.txt

    def _build_env(self):
        env = os.environ.copy()
        ldflags = env.get("LDFLAGS")
        if ldflags:
            rustflags = '= -C link-args="{}"'.format(ldflags)
        else:
            rustflags = ""
        env.update({"RUSTC": self._rustc,
                    "RUSTDOC": self._rustdoc,
                    "RUST_PATH": self._rustlib,
                    'RUSTFLAGS': rustflags})