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As of March 2013, openFrameworks has official makefile support for compiling the library itself. However, at the time of this writing, the changes haven't yet been merged into the stable release. You'll need to clone the Git repository and switch to the development branch.
git clone https://github.com/openframeworks/openFrameworks
cd openFrameworks && git checkout develop
cd libs/openFrameworksCompiled/project
make
As far as I can tell, we still need to use the unofficial solutions for compiling apps against the library.
Here's a link to a makefile which will compile an OpenFrameworks application on OsX:
https://gist.github.com/labe-me/1190981
Place the makefile in the apps' directory and run make. Tested on OsX 10.6, but haven't tried with addons yet.