These two fields allow to specify a different default assignee for ticket opened against this package in bugzilla. Note: The EPEL field is always displayed for packages in the 'rpms' namespace regardless of whether it is used in bugzilla or not.
LablGTK3 is an Objective Caml interface to GTK3.
It uses the rich type system of Objective Caml to provide a strongly typed, yet very comfortable, object-oriented interface to GTK3. This is not that easy if you know the dynamic typing approach taken by GTK3.