As I checked the debian/rules file and the errors given, it should be clear that the IBus itself is not built correctly.
You build flags looks reasonable but they are different from Arch's and Fedora's. (Arch and Fedora have been using IBus 1.5 for a while.) You probably hit some build system quirk? You probably also need to update dconf somehow as a post install action. (Since "make install" from source code would trigger such action.) -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org