codahale/bcrypt-ruby — pull request #45 by rking (2012-07-24 01:44:21+00:00)
Title: Switch 'util.h' to 'ruby/util.h'

I was getting this:
/usr/include/ruby-1.9.1/ruby/backward/util.h:2:2: warning: #warning use "ruby/util.h" instead of bare "util.h"

So this tiny patch fixes that warning.

I'm still not able to compile it successfully, due to an undefined reference to ruby_bcrypt() from https://github.com/codahale/bcrypt-ruby/blob/master/ext/mri/bcrypt_ext.c#L27 — So be warned, you should try to compile this first before you call it good (even though it's a dead simple patch.)