cmake KWSYS_C_HAS_PTRDIFF_T examples

Kitware/VTK Utilities/KWSys/vtksys/CMakeLists.txt :404

set_source_files_properties(ProcessUNIX.c System.c PROPERTIES
  COMPILE_FLAGS "-DKWSYS_C_HAS_PTRDIFF_T=${KWSYS_C_HAS_PTRDIFF_T} -DKWSYS_C_HAS_SSIZE_T=${KWSYS_C_HAS_SSIZE_T} -DKWSYS_C_HAS_CLOCK_GETTIME_MONOTONIC=${KWSYS_C_HAS_CLOCK_GETTIME_MONOTONIC}"
  )

InsightSoftwareConsortium/ITK Modules/ThirdParty/KWSys/src/KWSys/CMakeLists.txt :384

set_source_files_properties(ProcessUNIX.c System.c PROPERTIES
  COMPILE_FLAGS "-DKWSYS_C_HAS_PTRDIFF_T=${KWSYS_C_HAS_PTRDIFF_T} -DKWSYS_C_HAS_SSIZE_T=${KWSYS_C_HAS_SSIZE_T} -DKWSYS_C_HAS_CLOCK_GETTIME_MONOTONIC=${KWSYS_C_HAS_CLOCK_GETTIME_MONOTONIC}"
  )

Kitware/kwiver vital/kwiversys/CMakeLists.txt :494

SET_SOURCE_FILES_PROPERTIES(ProcessUNIX.c System.c PROPERTIES
  COMPILE_FLAGS "-DKWSYS_C_HAS_PTRDIFF_T=${KWSYS_C_HAS_PTRDIFF_T} -DKWSYS_C_HAS_SSIZE_T=${KWSYS_C_HAS_SSIZE_T}"
  )

ornladios/ADIOS2 thirdparty/KWSys/adios2sys/CMakeLists.txt :392

set_source_files_properties(ProcessUNIX.c System.c PROPERTIES
  COMPILE_FLAGS "-DKWSYS_C_HAS_PTRDIFF_T=${KWSYS_C_HAS_PTRDIFF_T} -DKWSYS_C_HAS_SSIZE_T=${KWSYS_C_HAS_SSIZE_T} -DKWSYS_C_HAS_CLOCK_GETTIME_MONOTONIC=${KWSYS_C_HAS_CLOCK_GETTIME_MONOTONIC}"
  )

gccxml/gccxml GCC_XML/KWSys/CMakeLists.txt :551

SET_SOURCE_FILES_PROPERTIES(ProcessUNIX.c System.c PROPERTIES
  COMPILE_FLAGS "-DKWSYS_C_HAS_PTRDIFF_T=${KWSYS_C_HAS_PTRDIFF_T} -DKWSYS_C_HAS_SSIZE_T=${KWSYS_C_HAS_SSIZE_T}"
  )