Issues when building without VTK

[humanoid2050]

I tried to compile without VTK, both through auto detection of VTK being missing and explicitly setting WITH_VTK=FALSE. In both cases, compilation failed with

In file included from /home/user/custom_builds/pcl/src/pcl-pcl-1.8.0rc2/io/tools/converter.cpp:52:0:
/home/user/custom_builds/pcl/src/pcl-pcl-1.8.0rc2/io/include/pcl/io/vtk_lib_io.h:57:24: fatal error: vtkVersion.h: No such file or directory

It seems that there is an unprotected reference to VTK components outside the parts disabled by the VTK flags.
As an additional comment, there is no FindVTK.cmake in cmake/Modules/. Not a problem if cmake can automatically find VTKConfig.cmake under a known directory, but cmake will throw a warning if not found. Additionally, the logic in CMakeLists.txt seems to leave VTK_FOUND and HAVE_VTK uninitialized in this situation.

[VictorLamoine]

My bad, I forgot to check that VTK is here to build pcl_converter and the David SDK grabber.
Pull request #1585 should fix the compilation.

[jspricke]

Should be fixed in master, Thanks!