RE: jam instead of make

["Larson, Timothy E." <TELarson%west.com@localhost>]

(Adding tech-pkg.)

> You could create a wip/mk/jam.mk that defines common do-{build,install}
> rules if ${USE_JAM} is set to "yes".

I do see several mentions of USE_[I|C]MAKE in the pkgsrc guide, so USE_JAM 
would parallel that.  But I also see that MAKE_PROGRAM gets set to gmake if 
gmake is in USE_TOOLS.  Which is the more correct/preferred way to go?

Thanks,
Tim