It looks like _smp_mflags could be used in the evolution specfile for building. At least it builds fine for me using make -j3.
Created attachment 94474 [details] Use _smp_mflags
It's broken in the past in our buildsystem when I've used it and there are definitely cases in the evolution makefiles that aren't make -j safe. The fact that you get lucky with -j3 could as well be luck based on the combination of speed + number of processors as anything.