Gentoo's Bugzilla –
Attachment 876483 Details for
Bug 919077x11-misc/pcmanfm: fails to compile (error: returning ‘FmDesktopItemAccessible *’ {aka ‘struct _FmDesktopItemAccessible *’} from a function with incompatible return type ‘AtkObject *’ {aka ‘struct _AtkObject *’} [-Wincompatible-pointer-types])