PHP wrapper to libgearman Formula was removed
Last versions were
php55-gearman requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
gearman 1.1.18 Application framework to farm out work to other machines or processes

Recent formula history

Mike McQuaid Deprecate tap.
ilovezfs php55-gearman: bottle revision to rebuild.
Andreas Braun Add description for gearman formula
Andy Blyler php55-gearman: convert from sha1 to sha256
Andy Blyler fix style issues

Formula code at GitHub