ninenines/erlang.mk — pull request #178 by gar1t (2014-12-11 21:11:34+00:00)
Title: Recompile on hrl changes without touching source files

The prior behavior modified source files (using touch) to trigger
a recompile whenever a hrl file was changed. This confuses editors,
which think the source files were actually changed by someone else.

The new approach set the date of the *.app file back to 00/01/01,
which has the same effect without confusing editors.