On Wed Nov 22 09:52:49 2017, michal wrote:
> Ah, then I misunderstood you, sorry.  Do you know which specific make
> implementations both support parallel processing and do not offer a
> mechanism to selectively disable it on a per-directory basis?

=> implementations no(ne) even I should check old bsdmake. But
specifications yes as -j is a POSIX flag and of course POSIX didn't
define a way to disable it.

BTW what I need is an easy and portable way to disable parallelism
for one entry, not the whole Makefile.