For example, developing with Qt in Ubuntu: apt-get a few packages and you can get started. In OS X: install XCode (> 1GB), set up macports, install Qt, wait several hours for it to finish compiling... (I know there are other ways to get Qt installed, but another tool I was using expected the macports layout)
Also, diversity: on Ubuntu, you either install .deb packages or compile stuff yourself. OS X has three competing packaging systems (macports, homebrew, fink), binary installers and manual compilation. Files can end up in very different places according to how they're installed.
Also, diversity: on Ubuntu, you either install .deb packages or compile stuff yourself. OS X has three competing packaging systems (macports, homebrew, fink), binary installers and manual compilation. Files can end up in very different places according to how they're installed.