output

dyld: lazy symbol binding failed: Symbol not found: _png_sig_cmp
  Referenced from: /usr/local/rvm/gems/ruby-1.8.7-p330@default/gems/phashion-1.0.3/lib/phashion_ext.bundle
  Expected in: flat namespace

dyld: Symbol not found: _png_sig_cmp
  Referenced from: /usr/local/rvm/gems/ruby-1.8.7-p330@default/gems/phashion-1.0.3/lib/phashion_ext.bundle
  Expected in: flat namespace

test.rb

require 'rubygems'
require 'phashion'

a = Phashion::Image.new('./a.png')
o = Phashion::Image.new('./o.png')

puts a.duplicate?(o)