I saw https://obs.kolabsys.com/package/view_file/Kolab:16/roundcubemail/roundcubemail.spec?expand=1
Roundcube 1.2:
- don't require pear's MDB2, Mail_mimeDecode, nor DB,
- don't require php-mcrypt,
- require php modules: pdo, openssl, session, json, pcre,
- require pear's Crypt_GPG >= 1.4.0 (for Enigma plugin).
Also, we're using Net_Sieve package from https://github.com/roundcube/Net_Sieve.git which supports PHP7.