libalerts_s.dylib is linking against the static version of spidermonkey (in the static-js configuration which is default on non-Windows) because it is using MOZ_JS_LIBS. I can't figure out why it needed to do this in the past (or whether this is just a copy/paste bug), but I'm going to fix it.
Created attachment 586458 [details] [diff] [review]
Fix libalerts naming and JS linkage, rev. 1