You should be able to build apkenv in Scratchbox (for Harmattan) using:

If dependencies are missing, you should get a list of packages that you need to install. If the build still fails, then the packaging information is incomplete, and we need to add more dependencies. In addition to the default repositories added, on Maemo 5 I usually add the extras-devel repository, and on Harmattan you don't need to add additional repositories.