Another question, according to the docs for the GTK module
http://pike.lysator.liu.se/generated/manual/modref/ex/predef_3A_3A/GTK.html
"GTK wrapper module.
This is a convenience module that is identical to either either the GTK2 or the GTK1 module depending on which (if any) of them is available"
On my Windows Pike 7.8.700 and on my Ubuntu Pike 7.8.700 I don't have a GTK wrapper module, just the real GTK2 module.
Should it exist a GTK wrapper module or is the documentation obsolete?
The documentation is newer than your Pike, since it is extracted from current Pike 8.0.