Not the most intuitive error message ever:
CMake Error at /usr/share/cmake/Modules/FindKDE4.cmake:98 (MESSAGE):
ERROR: cmake/modules/FindKDE4Internal.cmake not found
and the exact problem wasn’t immediately obvious to me, even after having dabbled in CMake-ing and KDE-ing for some time. Anyway, problem is simple – you’re missing some KDE development stuff. For me (OpenSUSE) I had to install the kdebase-workspaces-devel package. Look for something similar in your repositories and install it, and you should be good.