This directory, containing the amqp specifications to use, is read / pulled in by ruby-qpid via the /usr/lib/ruby/site_ruby/1.8/qpid/config.rb module.

If not present, it causes errors in the Qpid::Connection class.

To demonstrate on F15

$ sudo yum install ruby-qpid
$ irb
irb(main):001:0> require 'qpid'
=> true
irb(main):002:0>  c = Qpid::Connection.new(TCPSocket.new('localhost', 5672)) ; true
TypeError: can't convert Array into String
	from /usr/lib/ruby/site_ruby/1.8/qpid/spec010.rb:431:in `basename'
	from /usr/lib/ruby/site_ruby/1.8/qpid/spec010.rb:431:in `spec_cache'
	from /usr/lib/ruby/site_ruby/1.8/qpid/spec010.rb:451:in `load'
	from /usr/lib/ruby/site_ruby/1.8/qpid/connection.rb:47:in `initialize'
	from (irb):2:in `new'
	from (irb):2
	from /usr/lib/ruby/site_ruby/1.8/qpid/codec.rb:368
irb(main):003:0> ^D

Untar upstream source tarball and copy 'ruby/lib/qpid/specs' directory to /usr/lib/ruby/site_ruby/1.8/qpid/

$ irb
irb(main):001:0> require 'qpid'
=> true
irb(main):002:0>  c = Qpid::Connection.new(TCPSocket.new('localhost', 5672)) ; true
=> true


Note the 'rake build' command in the upstream source does not remove this directory, it simply is never installed via the specfile.

Should be a quick fix but I've also requested ACL rights in the pkgdb incase you don't have the cycles to resolve this.