There is something weirdly fascinating about compiling an editor and then immediately using it to continue editing its source code (even if it is Someone Else's Program). Also:
; ls -laL nvi $(which vim)
-rwxr-xr-x 1 root wheel 5683952 22 Nov 08:17 /usr/bin/vim
-rwxr-xr-x@ 1 drj staff 584496 31 Mar 17:25 nvi
Also: i have now started my personal edition of nvi that replaces cmake and ninja with a 5-line Makefile (takes just over 2 seconds to build on my Mac):