I haven't installed pyqt4 for python3, only for python 2.7.3 (and earlier). I've had a quick look at the source packages for python3/pyqt4 and am left confused!
pyuic4 is a very simple script:
It's trivial to get one that works for python3 and put it on your PATH. That should suffice for building fcronq. However, I can't see what is supposed to install it.
$ cat /usr/bin/pyuic4
# there's no main function, so just import the module
pyqt4-dev-tools does have a dependency on the python 2.7.3 and its libraries, so you probably don't want that.