build for port OpenSceneGraph returned: command execution failed

[Clemens Lang]

Your build tries to link against Inventor.framework in
/Library/Frameworks, but it doesn't contain the architecture you're
trying to install (x86_64). I don't know what Inventor.framework is and
how it got there, but it isn't present in my installation. iWork
apparently ships or shipped Inventor.framework in its app bundle, and
that is also i386/ppc-only.

-- 
Clemens Lang