This is a fork of libkml sources from: https://code.google.com/p/libkml/. Libkml sources in googlecode are svn versioning system. A git mirror is setup for the same using the method explained in: http://fredericiana.com/2010/01/12/using-svn-repositories-as-git-submodules/
Fixed build on Linux (gentoo, GCC). See this discussion: https://code.google.com/p/fritzing/issues/detail?id=1854