If you are ever configuring an app and see the message "gtkdocize not found" in Gentoo, then you need to emerge gtk-doc. I had some hard time figuring this out so I am writing it in my blog for the next time. When I saw that error message I did an "emerge -s gtkdocize". Usually it is that simple in Gentoo. But not this time. The emerge command returned no results at all. Then I searched for gtkdoc and still no luck. After searching in Google, I still did not have a solution. After thinking for a while I decided to try to search for gtk-doc. Bingo! That worked!
Interestingly, this is my first post from my Virtual machine :-)