The part of GConf2-devel was answered by maio, on IRC.
(05:39:36 PM) malo: urpmq --provides lib64GConf2-devel-3.2.5-1.mga2 (05:41:04 PM) malo: will tell you what are the provides. you then need to adjust the Requires of your package accordingly (05:41:25 PM) malo: Liutas: in this case, using Requires: pkgconfig(gconf-2.0) Liutauras
