I get the error messages below when trying to compile xorg-server (with Xnest 
enabled) on dbus 0.95 (1.0_rc3). Looks like API-breakage to me, dbus 1.0 is 
announced to be released today.

Workaround is disabling xnest.

ad ../../render/.libs/librender.a ../../randr/.libs/librandr.a ../../damageext/.libs/libdamageext.a ../../miext/damage/.libs/libdamage.a ../../miext/cw/.libs/libcw.a ../../miext/shadow/.libs/libshadow.a ../../Xi/.libs/libXi.a ../../xkb/.libs/libxkb.a ../../xkb/.libs/libxkbstubs.a ../../composite/.libs/libcomposite.a ../../dix/.libs/libxpstubs.a ../../os/.libs/libcwrapper.a ../../os/.libs/libos.a /usr/lib/libXfont.so /usr/lib/libfreetype.so /usr/lib/libfontenc.so -lz /usr/lib/libXext.so /usr/lib/libX11.so /usr/lib/libxcb-xlib.so /usr/lib/libxcb.so -ldl /usr/lib/libXau.so /usr/lib/libXdmcp.so -lm
../../config/libconfig.a(config.o): In function `configFini':
config.c:(.text+0x19): undefined reference to `dbus_error_init'
config.c:(.text+0x2f): undefined reference to 
`dbus_connection_unregister_object_path'
config.c:(.text+0x49): undefined reference to `dbus_bus_remove_match'
config.c:(.text+0x63): undefined reference to `dbus_bus_release_name'
config.c:(.text+0x70): undefined reference to `dbus_connection_unref'
config.c:(.text+0x97): undefined reference to `dbus_error_free'
../../config/libconfig.a(config.o): In function `configMessage':
config.c:(.text+0xe5): undefined reference to `dbus_error_init'
config.c:(.text+0xed): undefined reference to `dbus_message_get_interface'
config.c:(.text+0x11a): undefined reference to `dbus_message_new_method_return'
config.c:(.text+0x128): undefined reference to `dbus_message_iter_init_append'
config.c:(.text+0x144): undefined reference to `dbus_message_iter_append_basic'
config.c:(.text+0x165): undefined reference to `dbus_connection_send'
config.c:(.text+0x17c): undefined reference to `dbus_connection_flush'
config.c:(.text+0x184): undefined reference to `dbus_message_unref'
config.c:(.text+0x18c): undefined reference to `dbus_error_free'
config.c:(.text+0x1dc): undefined reference to `dbus_message_iter_init'
config.c:(.text+0x1f4): undefined reference to `dbus_error_free'
config.c:(.text+0x210): undefined reference to `dbus_error_free'
config.c:(.text+0x22d): undefined reference to `dbus_message_get_member'
config.c:(.text+0x26f): undefined reference to `dbus_message_get_member'
config.c:(.text+0x2b1): undefined reference to `dbus_message_get_args'
config.c:(.text+0x373): undefined reference to `dbus_message_iter_recurse'
config.c:(.text+0x37f): undefined reference to `dbus_message_iter_get_arg_type'
config.c:(.text+0x39f): undefined reference to `dbus_message_iter_get_basic'
config.c:(.text+0x3d5): undefined reference to `dbus_message_iter_has_next'
config.c:(.text+0x3e9): undefined reference to `dbus_message_iter_next'
config.c:(.text+0x3f5): undefined reference to `dbus_message_iter_get_arg_type'
config.c:(.text+0x411): undefined reference to `dbus_message_iter_get_basic'
config.c:(.text+0x43e): undefined reference to `dbus_message_iter_next'
config.c:(.text+0x44a): undefined reference to `dbus_message_iter_get_arg_type'
../../config/libconfig.a(config.o): In function `configDispatch':
config.c:(.text+0x586): undefined reference to 
`dbus_connection_read_write_dispatch'
../../config/libconfig.a(config.o): In function `configInitialise':
config.c:(.text+0x5d0): undefined reference to `dbus_error_init'
config.c:(.text+0x5e0): undefined reference to `dbus_bus_get'
config.c:(.text+0x5ee): undefined reference to `dbus_error_is_set'
config.c:(.text+0x5fa): undefined reference to `dbus_error_free'
config.c:(.text+0x62d): undefined reference to `dbus_connection_get_unix_fd'
config.c:(.text+0x694): undefined reference to `dbus_bus_request_name'
config.c:(.text+0x6a0): undefined reference to `dbus_error_is_set'
config.c:(.text+0x6ac): undefined reference to `dbus_error_free'
config.c:(.text+0x6b4): undefined reference to `dbus_connection_unref'
config.c:(.text+0x6ef): undefined reference to `dbus_bus_add_match'
config.c:(.text+0x6f7): undefined reference to `dbus_error_is_set'
config.c:(.text+0x75c): undefined reference to 
`dbus_connection_register_object_path'
config.c:(.text+0x768): undefined reference to `dbus_error_free'
config.c:(.text+0x78a): undefined reference to `dbus_connection_unref'
config.c:(.text+0x7bf): undefined reference to `dbus_bus_release_name'
config.c:(.text+0x7d4): undefined reference to `dbus_bus_remove_match'
config.c:(.text+0x7dc): undefined reference to `dbus_connection_unref'
config.c:(.text+0x7f0): undefined reference to `dbus_error_free'
config.c:(.text+0x805): undefined reference to `dbus_bus_release_name'
config.c:(.text+0x80d): undefined reference to `dbus_connection_unref'
collect2: ld returned 1 exit status
make[3]: *** [Xnest] Fehler 1
make[3]: Leaving directory 
`/var/tmp/portage/x11-base/xorg-server-1.2.99.0/work/xorg-server-1.2.99.0/hw/xnest'
make[2]: *** [all] Fehler 2
make[2]: Leaving directory 
`/var/tmp/portage/x11-base/xorg-server-1.2.99.0/work/xorg-server-1.2.99.0/hw/xnest'
make[1]: *** [all-recursive] Fehler 1
make[1]: Leaving directory 
`/var/tmp/portage/x11-base/xorg-server-1.2.99.0/work/xorg-server-1.2.99.0/hw'
make: *** [all-recursive] Fehler 1