minor Makefile changes for MacOSX
minor Makefile changes for MacOSX

frankong/bart,mjacob75/bart,Takishima/bart,mjacob75/bart,sdimoudi/bart,sidward/bart,sdimoudi/bart,mjacob75/bart,nckz/bart,mjacob75/bart,frankong/bart,Takishima/bart,grlee77/bart,Takishima/bart,frankong/bart,nckz/bart,sdimoudi/bart,mrirecon/bart,frankong/bart,mrirecon/bart,Takishima/bart,nckz/bart,sdimoudi/bart,sidward/bart,sdimoudi/bart,mrirecon/bart,sidward/bart,sidward/bart,mrirecon/bart,mrirecon/bart,nckz/bart,sidward/bart,frankong/bart,grlee77/bart,grlee77/bart,grlee77/bart,nckz/bart,grlee77/bart,Takishima/bart,mjacob75/bart