Removed unused makefile variable
Remove non-existent dir from makefile
Do not set makefile variable if not actually required
Use correct format specifier to avoid compiler warnings
Merge pull request #218 from varunbpatil/correct_format_spec

Use correct format specifier to avoid compiler warnings
Merge pull request #217 from varunbpatil/make_cleanup

Removed unused makefile variable
Merge remote-tracking branch 'upstream/master' into travis.osx