重装了2005.1，emerge sync后emerge mozilla出现以下错误

checking whether build environment is sane... yes
checking for strerror in -lcposix... no
checking for i686-pc-linux-gnu-gcc option to accept ANSI C... none needed
checking for a BSD-compatible install... /bin/install -c
checking whether make sets $(MAKE)... (cached) yes
checking for i686-pc-linux-gnu-pkg-config... no
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for BASE_DEPENDENCIES_CFLAGS...
checking for BASE_DEPENDENCIES_LIBS...
configure: error: Package requirements (glib-2.0 >= 2.7.1 atk >= 1.0.1
pango >= 1.9.0 cairo >= 0.9.2) were not met.
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively you may set the BASE_DEPENDENCIES_CFLAGS and
BASE_DEPENDENCIES_LIB
S environment variables
to avoid the need to call pkg-config. See the pkg-config man page for
more details.

!!! Please attach the config.log to your bug report:
!!! /var/tmp/portage/gtk+-2.8.8/work/gtk+-2.8.8/config.log

!!! ERROR: x11-libs/gtk+-2.8.8 failed.
!!! Function econf, Line 485, Exitcode 0
!!! econf failed
!!! If you need support, post the topmost build error, NOT this status
message.





请各位大侠帮助诊断一下！

我顶一下