sudar/Arduino-Makefile — pull request #300 by sej7278 (2014-11-29 22:39:42+00:00)
Title: Removed all double-quoting except for comments/echo's

Double-quoting was added in 7618da7 to allow for spaces in paths,
that was a bad idea as:

1. most GNU Make functions can't handle spaces
2. it breaks variable expansion on Linux/OSX e.g. ~/sketchbook
3. Windows doesn't like double-quotes - see d5c7ed1

So basically, don't put spaces in your paths, as most Make functions can't handle them, even if escaped, and its a bit dangerous when shelling out to grep etc.

Single-quoting is no better either.