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# Determine if X11 should be included.
# This provides a option to the user to not use X11 on systems where
# applicable. If systems where X11 is found and is not optional,
# it does not provide a CMake option instead the variable VTK_USE_X
# if set to ON.
FIND_PACKAGE(X11)
SET(VTK_USE_X_OPTIONAL 0)
SET(VTK_USE_X_DEFAULT 0)
IF(X11_FOUND)
IF(CYGWIN)
SET(VTK_USE_X_OPTIONAL 1)
ENDIF()
IF(APPLE)
SET(VTK_USE_X_OPTIONAL 1)
ELSE()
IF (VTK_OPENGL_HAS_OSMESA)
SET(VTK_USE_X_OPTIONAL 1)
ENDIF ()
SET(VTK_USE_X_DEFAULT ${VTK_USE_RENDERING})
ENDIF()
ENDIF()
VTK_DEPENDENT_OPTION(VTK_USE_X
"Build classes for the X11 window system."
"${VTK_USE_X_DEFAULT}"
"X11_FOUND;VTK_USE_RENDERING;VTK_USE_X_OPTIONAL"
"${VTK_USE_X_DEFAULT}")
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