Description of problem: GNUCash fails to build in mock because gettext is missing from buildrequires. gettext is used by the %find_lang macro
gettext is part of the stock buildroot. See http://fedoraproject.org/buildgroups/development/i386/buildroots.xml
Actaully, the fact that it's in buildroots.xml is decieving - it should be listed. Will be fixed in 1.9.6-1.