gentoo下编译notecase失败，求助

lrz

===> Linking bin/notecase
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/bin/ld: ./bin/eggtrayicon.o: undefined reference to symbol 'XUngrabServer'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/bin/ld: note: 'XUngrabServer' is defined in DSO /usr/lib64/libX11.so.6 so try adding it to the linker command line
/usr/lib64/libX11.so.6: could not read symbols: Invalid operation
collect2: 错误：ld 返回 1
make: *** [bin/notecase] 错误 1
emake failed
* ERROR: app-text/notecase-1.9.8::gentoo failed (compile phase):
* emake failed

求解。