[QUOTE=ponce;4445245]like knudfl said, I think you should
Code:
upgradepkg --reinstall /media/cdrom/slackware64/l/gtk+2-2.24.4-x86_64-1.txz
(I guessed the path)
it contains gtk/gtk.h[/QUOTE
I reinstalled the whole DVD packages excluding KDE again changed the buildscript to point to the latest source and it worked.