Sed failure in contrib/sboxes on MacOS

[Axel Kielhorn]

Hello,

I get the following error when building on MacOS 11:

sed: 17: ./contrib/sboxes/notquine.sed: unexpected EOF (pending }’s)

If I remove 

/\\##/{
  s/\\##//
  b}

It works:

/Applications/Xcode.app/Contents/Developer/usr/bin/make  all-am
  GEN      contrib/sboxes/msboxes.ms
  GROFF    contrib/sboxes/msboxes.pdf

Later I get:

sed: 1: "1i .lf 1 contrib/sboxes ...": command i expects \ followed by text

Sed doesn’t tell me its version but the man pages says March 27, 2017.

Greetings

Axel