Xcode 4 build succeeds, command line build fails?

Question

I have a project in Xcode 4 (the latest non-beta version) that builds fine when built in Xcode itself. Specifically, the Ld command correctly uses the derived data directory (wh

Answer 1

I got this error when I was experimenting with my files I add the @implementation to the .h file and left the .m file empty. I don't believe this is your error but if anyone else gets it maybe check that you haven't done this.