the search feature of this forum is really great

since most questions are answer already 10 times but ok

this should be fixed in most cases if you also do
--enable-cas
when compiling, since this was a configure bug in 2.0.3 if it does not fix the error msg then you dont have gd installed
you need gd-lib for images in the webserver and also images in cas.
if you really dont ahve gd-lib check your slackware packages it should be there somewhere, also check taht you install libpng if you want to use the webserver!
stefanero