Xcode projects are being exploited to spread a form of Mac malware specializing in the compromise of Safari and other browsers. The XCSSET malware family has been found in Xcode projects, "lead[ing] ...

I had a space in a directory name leading to the build. Putting webkit (and llvm) in ~/ fixed it. Weird. Annoying, but not at all unusual. There's so many components involved that one of them is bound ...