I decided to ditch EasyPeasy, since nobody seems to be supporting it
any more, and I installed a different distro (Peppermint Linux). It
has a newer version of qtmake in its repositories, and I was able to
build miniAudicle with no problem.

You might want to add a note to the build instructions, though,
telling people they need at least version 4.8 of qtmake.

Thanks for your help. If you ever need someone to help test under
Linux, let me know.