Support CMake-Version-Variables

[Andreas Pakulat]

Hi,

since we require Cmake 2.6 now I think we should support CMake's
"integrated" way of version-checking. CMake 2.6 supports this:

find_package(KDE4 4.2.0)

and I'm proposing the attached patch to make this work. This removes the
need for setting an extra variable before calling find_package, still
KDE_MIN_VERSION is given authority over the cmake-way for backwards
compatibility reasons.

Objections against comitting this?

Andreas

-- 
You will obey or molten silver will be poured into your ears.
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