wimp is a really simple window manager for X. It is written is C using Xlib.
You need the Xlib header files to compile wimp.
To build wimp enter the following command:
make
That will compile it and leave a executable in the wimp directory.
To install wimp either copy the executable to your path or run the following command, which will copy it for you (probably need root privileges, copying to /usr/bin/):
make install
In order to run wimp you will need to add the following to your .xinitrc:
exec wimp
Then start it using startx.