Homebrew/homebrew — pull request #34905 by tillt (2014-12-11 23:29:25+00:00)
Title: Added picojson header only library.

Given that the make install was recently merged into that project but no release has been done yet, this is currently using a commit hash specific tarball from out of picojson's master branch.
It should get updated as soon as there is a proper release of picojson that includes the make install.