Review Request 119849: Improve CMAKE error message when XRender or XFixes are missing

[Alexander Richardson]

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https://git.reviewboard.kde.org/r/119849/
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Review request for KDE Frameworks.


Repository: kwindowsystem


Description
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This is what would be printed previously:

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
X11_Xrender_LIB (ADVANCED)
    linked by target "KF5WindowSystem" in directory /foo/bar

Now we print:

The XRender library could not be found. Please install the development package for it.


Diffs
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  src/CMakeLists.txt 2794ed1e6f56ed521d845bc20ba1c027493e14e7 

Diff: https://git.reviewboard.kde.org/r/119849/diff/


Testing
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Thanks,

Alexander Richardson

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