[Paraview] plugins with 5.2

[Burlen Loring]

After upgrading to 5.2 my plugin is not compiling. When I configure the 
plugin I see a few pages of the following:

    CMake Warning (dev) at io/CMakeLists.txt:54 (add_library):
       Policy CMP0028 is not set: Double colon in target name means ALIAS or
       IMPORTED target.  Run "cmake --help-policy CMP0028" for policy
    details.
       Use the cmake_policy command to set the policy and suppress this
    warning.

       Target "teca_io" links to target "Qt4::QtCore" but the target was not
       found.  Perhaps a find_package() call is missing for an IMPORTED
    target, or
       an ALIAS target is missing?
    This warning is for project developers.  Use -Wno-dev to suppress it.

then linker errors

    [ 32%] Linking CXX shared library ../lib/libteca_io.so
    /bin/ld: cannot find -lQt4::QtCore
    /bin/ld: cannot find -lQt4::QtGui
    collect2: error: ld returned 1 exit status
    io/CMakeFiles/teca_io.dir/build.make:402: recipe for target
    'lib/libteca_io.so' failed
    make[2]: *** [lib/libteca_io.so] Error 1
    CMakeFiles/Makefile2:196: recipe for target
    'io/CMakeFiles/teca_io.dir/all' failed
    make[1]: *** [io/CMakeFiles/teca_io.dir/all] Error 2
    Makefile:127: recipe for target 'all' failed
    make: *** [all] Error 2

It's not a library so I set  the policy to new,  and the cmake configure 
errors out. Any idea what's missing?

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