git repositories on github have branches which should match:

master --> cssu-devel
stable --> cssu-stable

cssu-testing currently is not branched, packages comes from cssu-devel. cssu-stable packages comes from cssu-testing repository after they are heavily tested. In some cases cssu-stable packages could be different as in cssu-testing (in case we need to patch old cssu-stable package, but do not want to use cssu-testing yet).

http://repository.maemo.org/pool/maemo/ossw is IIRC Maemo 1.0 and must not be used for Maemo 5.

You should use only Maemo 5 SDK repos (+ possible correct CSSU repo; e.g when building cssu-stable package, you can use cssu-stable repo, but not cssu-testing!), no Extras, no other repositories. If it is not possible (e.g there are missing dependences, or anything else), please ask us on IRC.

About that mawk, I do not know... merlin1991 should know it as he built those packages.