When I try and install MacPorts it complains 'Xcode is not installed, or was installed with UNIX Development (10.5+) or Command Line Support (10.4) deselected.'
I do have Xcode installed from the Appstore so I guess I just have to install these extra parts but how ?
Ive read a couple of questions on Stack Overflow about this but I think the answers must be outdated as they do notmake sense for me, I do not have an Xcode dmg I can reinstall from, and I can't see anything useful in /Developer either, or any preferences within Xcode itself.
I only want Xcode for the purposes of using Macports so I'm not familiar with it.
You probably got Xcode 4.1 from the Mac App Store. In that case, you haven't got Xcode 4.1 installed. However, you now have an Xcode installer in your Applications directory.
Spotlight should find it in any case.
The command line tools aren't included in the default install of Xcode anymore. Goto the Xcode Preferences --> Downloads Pane --> click the Install button beside "Command Line Tools". If you don't have Xcode installed you can get the command line tools separately as explained here..
http://osxdaily.com/2012/07/06/install-gcc-without-xcode-in-mac-os-x/
The App Store installs the XCode installer, not Xcode itself. The installer is in your applications folder. Run that.
Today, 16 Feb 2012, when I installed Xcode 4 from the App Store, there was no Setup. Just the app installed, because it was Xcode 4.3 !
Make sure that you install Xcode 4.2 with UNIX Devel. to MacPorts works!
To get the Xcode 4.2 go to https://developer.apple.com.
来源：https://stackoverflow.com/questions/7442447/how-do-i-install-additional-packages-for-xcode-on-osx-lion-to-allow-macports-to