>  # install X11 session file /usr/share/xsessions (changed from 
>/etc/X11 sessions)
>  install -d -m755 ${pkgdir}/usr/share/xsessions
>  install -m755 ${srcdir}/trinity.desktop
>${pkgdir}/usr/share/xsessions/trinity.desktop

Why are you using the file name trinity.desktop rather than 
tde.desktop? The tdebase sources create tde.desktop.

Darrell