Building Firebird Sql is now easy with Github Codespaces (default is ubuntu lts + vscode) choose a branch click Code create code space sudo apt-get update sudo apt-get install libtommath-dev libtomcrypt-dev ./autogen.sh --prefix=/opt/firebird4 or 5 make make install
https://github.com/features/codespaces Also there is prebuild for open source organizations https://github.surveymonkey.com/r/2X56RCW
Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
