iirc, make doesn't pass the -j option down to sub-make processes, so it wouldn't really be useful for ports compilation (since the actual port Makefile doesn't do any compiling itself, it unarchives the distfile into work/ and then runs a sub-make in the dist directory to actually do the build.)
One of these days, I'd rather like to see a make.conf option or somesuch to have a default number of compiler instances so that -j wouldn't even be needed, as make would be parsing make.conf each time it runs regardless.
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