fromspackimport*classDtlink3(Package):"""Simple package which acts as a link dependency"""homepage="http://www.example.com"url="http://www.example.com/dtlink3-1.0.tar.gz"version('1.0','0123456789abcdef0123456789abcdef')depends_on('dtbuild2',type='build')depends_on('dtlink4')definstall(self,spec,prefix):pass