I understand that you suggest you can't build the Lazarus IDE with defining
fpGUI or CustomDrwan instead of Qt or Gnome (or Windows or Cocos).
Maybe I did not understand well.
AFAIK, for Unix os, Lazarus and LCL-widget-set need a "big native" widget-set, like GTK, KDE or Qt.
IMO (maybe I am wrong) LCL is, to resume, a "Pascal Header" of GTK, KDE or Qt widget-set C libraries.
In theory it is possible to build Lazarus with fpGUI-pure-X-widget-set but I was never able to do it work.
Also IMO (maybe I am wrong too for this), even for CustomDraw, a "big native·widget-set" is needed.
The polYdev "pure X" iso-cd is about 350 megas (with webbrowser-Opera, 5 different fpc, all video codec, audio+video player, ide, window-manager, wine decoder, etc...).
Installing the Gnome or KDE packages will need +- 950 megas more !
Fre;D
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Many thanks ;-)