emerge xgl时gail出现了问题

ppif

gail.c: In function `gail_focus_notify':
gail.c:576: error: `ATK_ROLE_REDUNDANT_OBJECT' undeclared (first use in this function)
gail.c:576: error: (Each undeclared identifier is reported only once
gail.c:576: error: for each function it appears in.)
gail.c: In function `gail_focus_tracker':
gail.c:769: error: `ATK_ROLE_REDUNDANT_OBJECT' undeclared (first use in this function)

按照wiki上的how to一步步来的，到最后一步emerge -av xgl compiz时出现了这个错误，请问怎么解决啊？