Update to 4.6.0
most of our patches was easy to apply.
Regarding the mangling, I added the symbols that appear in libtiff/libtiff.map
but not in libtiff/vtk_tiff_mangle.h
.
Compiling with VTK at master in vtk/vtk!10634 (merged) and checking via nm -g lib/libvtktiff-9.3.so
does not show any unmangled symbol.