Per this answer on stackoverflow: http://stackoverflow.com/a/2832003
The ruby-prof gem requires Ruby v1.9.3 or newer.
The current release of RSpec is v3.x. It is incompatible with the specs defined in amq-protocol due to the elimination of such constructs as 'its' blocks.
…frames" This reverts commit 4e7a877. Breaks some of the tests.