When i go to build dbus this failed, this patch attached fix the error.
Created attachment 164190 [details, diff] dbus-1.2.3-darwin.patch
Created attachment 164192 [details, diff] dbus-1.2.3.ebuild.patch
I changed the existing darwin patch to do the crt_externs.h include first thing instead of last thing. Can you check if this works?
assuming yes.