Correct way to set target include directory property ?

[Alexander Neundorf]

Hi,

I just made kconfigwidgets build also standalone[1].

It didn't work immediately, since it didn't have the correct include dirs set. 
As I understand it, they should come from the KWidgetsAddons and KConfig 
libraries it links against, but those do not yet set them.

Attached is what I committed to set the include directory properties for those 
libraries.
Is this the correct way to do it or is there a better way ?

It would be nice if cmake would handle relative directories for the INSTALL 
interface automatically as relative to CMAKE_INSTALL_PREFIX.


Alex

[1] This is only *possible* at all by using variables like 
${KWidgetAddons_LIBRARIES}. And as I noticed, there is more work to do to make 
this stuff build also standalone than simply renaming the targets. It has to 
be checked whether the include dirs are correct, etc.[2]

[2] that's what I meant when I mentioned some time ago that it would be good 
to have an easy to way to test install Config.cmake files, i.e. check whether 
the properties are set correctly etc.
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