|Note: This page is about KDE 4. It isn't applicable for KDE 3 development.|
The page on building KDE4 trunk makes a few assumptions about your environment. Note that FreeBSD's dbus and cmake ports will work (so those sections can be skipped).
The kdesvn-build script can be used on FreeBSD with one change. qt-copy is going to fail to build dbus support due to reasons described below, so you can either run "kdesvn-build qt-copy" once... apply the fix below, then run "kdesvn-build". Alternatively, you can add "-lpthread" to the configure-flags in the qt-copy section of your .kdesvn-buildrc .
This is related to the test app for dbus in qt-copy not linking due to a pthreads dependency in libdbus on FreeBSD. To fix it go to: (builddir)/qt-copy/config.tests/unix/dbus . Then manually run
g++ dbus.o -lpthread -ldbus-1 -L/usr/local/lib -o dbus
That should generate the "dbus" file, and you should be able to continue your qt build as you left off, building dbus this time
See the above question on dbus not compiling (even if you told it to compile). If QT can't find the dbus libs, it silently fails and will continue to build without dbus.