sudar/Arduino-Makefile — pull request #241 by sej7278 (2014-08-17 17:32:02+00:00)
Title: Fix regex for "make show_boards" on 1.5

In 1.5.6 the Due board has an underscore, this regex tweak allows for:

arduino_due_x_dbg Arduino Due (Programming Port)
arduino_due_x Arduino Due (Native USB Port)