for "make upx-app" I had to do "make upx" and for "open build/GopherEyes.app" I had to do "open build/gophereyes" otherwise, great stuff, thanks :)
for "make upx-app" I had to do "make upx"
and for "open build/GopherEyes.app" I had to do "open build/gophereyes"
otherwise, great stuff, thanks :)