unable to compile, kdelibs

i have just switched to 3.1.95 and got this problem : when i try to compile a program and at configure i get this error : checking if UIC has KDE plugins available... no configure: error: you need to install kdelibs first. btw : i have kdelibs and kdelibs-devel installed and when i was using 3.1.4 i didn't have this problem please help