msgpack/msgpack — pull request #123 by brixen (2012-12-17 00:32:02+00:00)
Title: Update ruby/compat.h

The exceptions for Rubinius are unnecessary now and are actually
causing msgpack not to install due to the incorrect function prototypes
that are in this file. In MRI, this is the prototype

VALUE rb_gc_enable();

Anyway, these are unnecessary for Rubinius.