Wexus requires QT4 and CMake. You'll need git to get the sources.
First, check out wexus2 from git, then create a build directory under that:
git clone <GITURL> cd wexus2 mkdir build cd build
Now, run cmake and configure wexus. Alternatively, you can run ccmake (for a console interface) or cmake-gui (for a graphical one).
Finally, compile wexus. Note first you can only build the wexusmake utility. With this utility you generate some files and then run cmake again, to build wexusserver:
make ./wexusmake ../wexus2.src cmake ../wexus2.src make
You should now have two executables: wexusmake (the programmers utility) and wexusserver (a command line web server)