OpenGFX 0.4.2 (08 Feb 2012)
---------------------------
- Fix: [Makefile] Force makefile to build with one thread only as gimp might barf on running in parallel (issue #3439)
- Fix: [Makefile] Don't remove the reference md5 file when using maintainer-clean (issue #3440)
- Fix: The grfID of the extra grf was wrong... and would be found as NewGRF
- Fix: sprite are out-of-bound, sadly nmlc doesn't warn/error about (issue #3667)