Portable reimplementation of Impulse Tracker

Current versions

schismtracker requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
automake 1.15.1 Tool for generating GNU Standards-compliant Makefiles
sdl 1.2.15 Low-level access to audio, keyboard, mouse, joystick and graphics

Formula history

ilovezfs schismtracker 20170910
ilovezfs schismtracker: use assert_predicate instead of File.exist?
ilovezfs schismtracker 20170420
Viktor Szakats schismtracker: remove protocol from param
Thierry Moisan schismtracker 20160913
Mike McQuaid Use hash rockets again. (#5177)
Mike McQuaid Use Ruby 1.9+ symbol hash keys in all formulae. (#4942)
Viktor Szakats schismtracker: update urls, depend on automake
Misty De Meo schismtracker 20120105