Extension to modify consts/functions/classes Formula was removed
Last versions were
php54-runkit requires the following formula to be installed:
autoconf 2.69 Automatic configure script builder

Recent formula history

Mike McQuaid Deprecate tap.
Andreas Braun Add description for runkit formula
Andy Blyler php54-runkit: convert from sha1 to sha256
Andy Blyler fix style issues
Denis Denisov update runkit

Formula code at GitHub