liblwjgl.dylib in the nightly is only a couple hundred bytes and fails to load on OS X ("no suitable image found, file to short").
Hmm, weird. You can also download it from here (http://ci.newdawnsoftware.com/view/LWJGL/job/LWJGL-git/label=OSX/) (direct link (http://ci.newdawnsoftware.com/view/LWJGL/job/LWJGL-git/label=OSX/lastSuccessfulBuild/artifact/libs/macosx/liblwjgl.dylib)).
Same happens to me with the latest nightly (this happened with a lot of 2.9.2 builds).
The liblwjgl.dylib is 952 bytes. It should be 900+ KB.
The liblwjgl.dylib file in the latest builds is a 404 page instead of a proper file.
What's the process of getting the build launched again? Although maybe the problem is that the build is not really passing and the artifact is not being generated...
2.9.2 nightly builds are back online now. Sorry for taking so long to fix this.