mbunkus/mkvtoolnix — pull request #18 by maru-sama (2012-08-12 17:35:22+00:00)
Title: Fix compilation with Ruby 1.8.7

Commit 79421eaa6 introduced Dir.exists which is only available in
Ruby 1.9 and upwards. Change this to File.directory so it also
compiles with 1.8.7.