Unexpected header files error when installing on Mac with Homebrew

[huynhcongdanh]

Unexpected header files error when installing on Mac with Homebrew

python setup.py install

.....

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected header files:
/usr/local/include/....

Environment:
OS: Mac OS 10.12
Python: 2.7.14 installed via Homebrew