[vtk-developers] Checking if FreeType was found properly

[David Doria]

We recently added an example to the wiki that uses FreeType. When I
try to compile the examples repository now, I get this error:

In file included from /home/ddoria/src/VTK/Utilities/vtk_freetype.h:22:0,
                 from /home/ddoria/src/VTK/Rendering/vtkFreeTypeUtilities.h:35,
                 from /home/ddoria/src/WikiExamples/Cxx/Images/ImageText.cxx:6:
/usr/include/ft2build.h:56:38: fatal error:
freetype/config/ftheader.h: No such file or directory compilation
terminated.

I had fixed it when writing the ImageText example by playing with
VTK_USE_SYSTEM_FREETYPE and some PATH variables, but is there way to
check with CMake if FreeType was found correctly enough to continue,
else do not build that example?

Thanks,

David