botandrose/sprockets-image_compressor — pull request #19 by JakeTheSnake3p0 (2014-09-01 23:55:49+00:00)
Title: Warn user about inaccessible system_binary executables

sprockets-image_compressor vaguely fails when precompiling, but makes no mention of why. I tracked down my problem to the fact that the executable was "found", but still inaccessible - which meant that the output file was never created. The gem now looks to see if the executable file actually exists.