In trying to install Femtoos I ran into some difficulties with the build script and OS X. Rudd doesn't have time to incorporate them into his source at this time, and suggested I post them to a user forum so others could use them too. I am running OS X 10.6.8 and using Femtoos 0.922. To use the patches, apply use_cvs_instead_of_wget.patch in the directory Install_Scripts. Then copy the other three patches to the patches directory. Then run the install as recommended in the Readme. I am not sure if the documents for gcc and binutils render properly after the code changes, but they build at least. Hoping this helps someone else too. Take care.