How to get the cool v8.18.0.15-2025-09-17-47ef361823 version?

Only recently I noticed that building Racket from Git HEAD gave the cool commit-sha version. I suppose this has be added to Racket for a long time, but I still don't get the commit-sha versions when building the git clone on an old computer. What configuration file do I need to delete to enable this?

To answer: a clone with previously built Racket contains a config.rktd file in <REPO>/racket/etc. Add an entry automatic-development-build-stamp? to the hash and set its value to #t before re-building Racket:

#hash((automatic-development-build-stamp? . #t)   ;;   <- add this
      (catalogs . ("../share/pkgs-catalog" #f))
      (default-scope . "installation")
      (installation-name . "development")
      ...
      )
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