because some of the commands below run Make, so they need
Makefiles to be present.
+ For Emacs 28, and as long as --with-native-compilation is not the
+ default, the tree needs to be configured with native-compilation
+ enabled, to ensure all the pertinent *.elc files will end up in
+ the tarball. Otherwise, the *.eln files might not build correctly
+ on the user's system.
+
2. Regenerate the etc/AUTHORS file:
M-: (require 'authors) RET
M-x authors RET