single-threading targets although make was invoked with -jX ?

[Per Jessen]

I've got numerous makefiles that are all run with -jX depending on the
available hardware etc.  Occasionally I have the need to single-thread
the making of one type of target - I know I can achieve this
with .NOTPARALLEL, but because that applies to an entire Makefile, I
was wondering if there was a simpler way?  Maybe a flag for a rule that
indicates "only one at a time" or some such? 


/Per Jessen, Zürich