It looks like it's fixed here: https://github.com/openssl/openssl/pull/18247
- Bug#1010958: sscg FTBFS with OpenSSL 3.0 Adrian Bunk
- Bug#1010958: sscg FTBFS with OpenSSL 3.0 Martin Pitt
- Bug#1010958: sscg FTBFS with OpenSSL 3.0.3 Kurt Roeckx
- Bug#1010958: sscg FTBFS with OpenSSL 3.0.3 Martin Pitt