Compile prob on RH9 -kdelibs (NOT!) missing???

Hello,

I am trying to compile kbabel 1.2 ...

running ./configure ->

...
checking for Qt... libraries /usr/lib/qt-3.1/lib, headers
/usr/lib/qt-3.1/include using -mt
checking if Qt compiles without flags... no
checking for moc... /usr/lib/qt-3.1/bin/moc
checking for uic... /usr/lib/qt-3.1/bin/uic
checking whether uic supports -L ... yes
checking whether uic supports -nounload ... yes
checking if Qt needs -ljpeg... no
checking for rpath... yes
checking for KDE... libraries /usr/lib, headers /usr/include/kde
checking if UIC has KDE plugins available... no
configure: error: you need to install kdelibs first.

???

Considering i've got the following rpm packets:

both qt & -devel version 3.1.4-0.9x.1
both kdelibs & -devel version 3.1.2-14

To be sure, I installed pretty much all those kde packages I could think
somehow might be used; for example the kde-sdk, kde-util etc. packages,
too.

I have a bad feeling this is something trivial...? But I cannot figure it
out, being relatively inexperienced what it comes to compiling kde apps.
Therefore, I'd greatly appreciate any help.

Thanks,

 Petri