I have run #prg-get -if depinst xfce4 but the installation failed and the reason was lack of the package gtk and libnotify. I have tried to install libnotify but it failed again because the lack of gtk again. I have checked (/usr/ports/contrib) and gtk is installed so it is a matter of upgrading the package, I suppose.

So I think I have to use pkdgadd to upgrading the package, but I have checked that there are the packages gtk-doc, gtk-engine-murrine, gtk-recordmydesktop, gtkglest, gtkmm, gtkspell. Shall I upgrade all of them?

I also faced some difficult with the name and version of the package to run #pkgadd -u <package>.

I looked at the Pkgfile, for example, of gtk-doc and verified that its version is 1.19, so the package to be upgraded would be: gtk-doc-1.19.tar.xz or gtk-doc-1.19.pkg.tar.xz (sorry for this newby part of my question).