Library "not found" after building test with CMake on Ubuntu.

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I think that CMake is setting RUNPATH correctly (my understanding is that RUNPATH has superseded RPATH). This is a part of what readelf -d returns for the executable … by now, I am starting to get the feeling that this really isn’t VTK’s fault at all, but I figured that there were plenty of other VTK users on Ubuntu who might know the answer …

[me@laptop build]$readelf -d test 

Dynamic section at offset 0x4b50 contains 42 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libvtkInteractionStyle-9.0.so.1]
... stuff ...
 0x0000000000000001 (NEEDED)             Shared library: [libstdc++.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libgcc_s.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000001d (RUNPATH)            Library runpath: [/home/me/opt/vtk/lib]
... morestuff ...