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Brad King authored
Move the search for the Ghostscript executable added by commit 870dd114 (Add new GL2PS testing system using ghostscript, 2012-10-01) into a dedicated vtkGhostscript module. Include it from CMakeLists.txt that need VTK_GHOSTSCRIPT_EXECUTABLE. This avoids keeping module-specific code in the top-level CMakeLists.txt file and enables the corresponding tests in the Testing/External build. Change-Id: I410737f16c653aaaa60799ce1471cb1798707079
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