wow... this explains why I have been with the impression of so many installers having issues run in parallel; but then work fine if rerun again in isolation! I had assumed some common file collision, but an rm -rf on a dir like /tmp/NCBI* etc could also explain such cases...

if you agree, it would be nice to have the option to de-parallelize builds of the same package, because they are prone to bring up failure modes that the developers did not consider in their installation mechanisms...