licence-check is .PHONY, and I had put it on the left of the colon as a
prerequisite of the install rule. A phony prerequisite is always out of date,
so `make` reinstalled the whole of zsh every single time -- slow, and
eventually fatal: zsh's installfns.sh trips over the installfnsdir its own
previous run left behind, so the build failed outright with
install: cannot stat 'installfnsdir/_vcs_info_hooks'
It runs inside the rule now, which is what it always should have done, and the
stale directory is removed first.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VQ7Qx8E1q1M1bbCq8QLHS2
6ff84e5bf4