For correct operation, GDK2.pmod and Gnome2.pmod must be copied to 
  /pike//lib/modules.

Or, you can copy those files to src/Pike-v/lib/modules, and remake
  and reinstall pike.

Then, change to this module, type pike -x module, then as root,
  pike -x module install.

You should be able to run the test programs located in tests/.

The programs oo.pike, test1.pike, and demo.pike are unfinished, but the
other tests should work.