Version: (using KDE 4.4.2) Compiler: gcc (Ubuntu 4.4.1-4ubuntu9) 64 bit OS: Linux Installed from: Ubuntu Packages The header files for the KDEPIM classes are not properly installed when installing the development packages for kdepim. It seems no header file is included in the packages. A Debian bug from 2006 indicates that it's an upstream error. Try to install the header files and check for (eg kdateedit.h) in the location where it should go. Links: [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=366548
The libraries in the kdepim module are not public API: The API and ABI can change without notice. Therefore, the headers are not installed, since this private API should only be used by applications inside the kdepim module. For KDateEdit, the idea is to eventually move it to kdepimlibs or kdelibs, so that it can be used by other applications, but I don't know the progress on this one.