Added support for somewhat-parallel make. #522
Merged
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The implementation is that the "master make" doesn't run parallel, but all the sub-make calls do. This keeps the dependencies in external/ from walking over one another. To actually use this, you'll need to either modify Make.inc or call:
$ make -DPARALLEL_BUILD_JOBS=n
Also be careful that you give your VM enough memory to parallel-link LAPACK/BLAS. Speaking from experience.