CEN64-Qt is a simple frontend using QT. It allows one to select rom, set rompath, and convert to Z64 format if need be.
You'll need to make sure you have qmake, g++ and the Qt development libraries installed. On Debian/Ubuntu, this can be accomplished by:
# apt-get install qt4-qmake g++ libqt4-dev
Once the needed packages are installed, create the Makefile with qmake and then build with make:
$ qmake $ make