This points to the next Ubuntu "main".
It includes also the packages from KUbuntu, XUbuntu and Edubuntu.
This project does not contain any packages
Current project config asks for libmpfr4 and upstart-compat-sysv, but these do not exist any longer in bionic (18.04). So builds are not possible.
There is libmpfr6 (from source package mpfr4):
Thanks, adapted and removed the two further offenders... at least build package is building now again.
Open Build Service (OBS) is an openSUSE project.