Can I somehow persuade the same machinery that `build.sh install=/' uses to install only those parts that are relevant to the subtree that I wanted to rebuild? What I do is do a full build on one machine after updating along a branch, and then use INSTALL-NetBSD from sysutils/etcmanage to write those bits (the entire bits) over the running system on another machine. I find this easier and safer - and faster overall - than mucking with partial builds and getting it wrong. To make /usr/src work on nfs mounts etc., I'd put the sources at /usr/ANONCVS/src on one machine, and symlink that path to the /nfs/foo/usr/ANONCVS/src on the other, so the absolute paths work. Also try USETOOLS=no to avoid $TOOLDIR. But really, my advice is to give up on the notion that partial builds are what you want.
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