mxcl/homebrew — pull request #16329 by skroll (2012-11-30 22:25:53+00:00)
Title: Working universal binary build for libyaml

Previously, the libyaml formula used ENV['CFLAGS'] = "-arch i386 -arch x86_64" and ENV['LDFLAGS'] = "-arch i386 -arch x86_64", which superenv removes. In order to get the universal builds, ENV.universal_binary must be used instead.