[gtkada] Win32 package is missing while compiling testgtk

[manuel.op.de.coul at eon-benelux.com]

You're probably using GNAT 3.14. Since that version, the win32
bindings are in a separate file. You need to install

ftp://ftp.cs.kuleuven.ac.be/pub/Ada-Belgium/mirrors/gnu-ada


 4768011 Nov 23 12:34 3.14p/winnt/gnatwin-3.14p.exe

Manuel