-critical update-
you will need the entities from urban terror to show up in your entity list.
to do this you need an updated entity definition file
this file is attached to this post
place this file in your gtk radiant 1.5.0\q3.game\baseq3 folder
for instance mine looks like c:\program files\GTK Radiant 1.5.0\q3.game\baseq3\urban terror.def
if this works, you will see "ut" in the entities drop down menu. this contains all of the weapons and items. Also, under info, you will see a info_ut_spawn entity. this is used for spawning teams in UT
to set the team, use key "team" and value "team color" red or blue of course i,e "red"
I will make another tutorial covering compiling more thoroughly to make sure everything is working right on EVERYONES computers