How do I use qmake to build multiple binaries in a single project?

I'm writing a small qt app suite that consists of a set of small programs that work on the same set of files. They are organized like this:

/
  app1/
    main.cpp
  app2/
    main.cpp
  app3/
    main.cpp
  common/
    project.h
    project.cpp
    somemore.h
    somemore.cpp
  appsuite.pro

When I do qmake && make, I want the following binaries to be built:

• app1/app1
• app2/app2
• app3/app3

How do I write appsuite.pro to work like this?
I have heard something about .pri files, but I could not figure out how to use them in my "situation".

Help appreciated,
jrh