Version: (using Devel) Compiler: g++ (GCC) 4.2.4 OS: Linux Installed from: Compiled sources To build kdepimlibs on Kubuntu 7.04 you need to manually build and install a newer version of libical. I did it but installed to /usr/local instead of /usr and as KDEPimLibsDependencies.cmake only expects libical to be installed on /usr, compilation fails. After manually changing the paths it compiles just right.
Have you updated your sources recently? I'm pretty sure we fixed this a week ago (approximately). Make sure you have a very recent kdepimlibs from trunk.