Please note that the official way to get wiringPi is via git from git.drogon.net and not GitHub.
git clone git://git.drogon.net/wiringPi
The version of wiringPi held on GitHub by “Gadgetoid” is used to build the wiringPython, Ruby, Perl, etc. wrappers for these other languages. This version may lag the official Drogon release. Pull requests may not be accepted to Github….
for the official documentation, etc. and the best way to submit bug reports, etc. is by sending an email to [email protected]