/usr/lib/InsightToolkit/UseITK.cmake is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file sets up include directories, link directories, and
# compiler settings for a project to use ITK. It should not be
# included directly, but rather through the ITK_USE_FILE setting
# obtained from ITKConfig.cmake.
#
# Add compiler flags needed to use ITK.
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${ITK_REQUIRED_C_FLAGS}")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ITK_REQUIRED_CXX_FLAGS}")
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${ITK_REQUIRED_LINK_FLAGS}")
SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${ITK_REQUIRED_LINK_FLAGS}")
SET(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${ITK_REQUIRED_LINK_FLAGS}")
# Add include directories needed to use ITK.
INCLUDE_DIRECTORIES(BEFORE ${ITK_INCLUDE_DIRS})
# Add link directories needed to use ITK.
LINK_DIRECTORIES(${ITK_LIBRARY_DIRS})
# Load settings fro the system VXL with which ITK was built, if any.
IF(ITK_USE_SYSTEM_VXL)
# If VXL has already been found, make sure it is the one used to
# build ITK.
IF(WIN32 OR APPLE)
STRING(TOLOWER "${VXL_DIR}" ITK_CHECK_VXL_DIR)
STRING(TOLOWER "${ITK_VXL_DIR}" ITK_CHECK_ITK_VXL_DIR)
ELSE(WIN32 OR APPLE)
SET(ITK_CHECK_VXL_DIR "${VXL_DIR}")
SET(ITK_CHECK_ITK_VXL_DIR "${ITK_VXL_DIR}")
ENDIF(WIN32 OR APPLE)
STRING(COMPARE EQUAL "${ITK_CHECK_VXL_DIR}" "${ITK_CHECK_ITK_VXL_DIR}"
ITK_VXL_DIR_MATCH)
IF(VXL_FOUND)
IF(NOT ITK_VXL_DIR_MATCH)
MESSAGE(FATAL_ERROR
"ITK was built with VXL from \"${ITK_VXL_DIR}\", "
"but this project is using VXL from \"${VXL_DIR}\". "
"Please set VXL_DIR to match the one used to build ITK."
)
ENDIF(NOT ITK_VXL_DIR_MATCH)
ELSE(VXL_FOUND)
IF(VXL_DIR)
IF(NOT ITK_VXL_DIR_MATCH)
MESSAGE(
"Warning: ITK was built with VXL from \"${ITK_VXL_DIR}\", "
"but this project has set VXL_DIR to \"${VXL_DIR}\". "
"ITK is changing VXL_DIR to match the VXL with which it was built."
)
ENDIF(NOT ITK_VXL_DIR_MATCH)
ENDIF(VXL_DIR)
SET(VXL_DIR ${ITK_VXL_DIR})
FIND_PACKAGE(VXL)
IF(VXL_FOUND)
INCLUDE(${VXL_CMAKE_DIR}/UseVXL.cmake)
ELSE(VXL_FOUND)
MESSAGE(FATAL_ERROR
"UseITK could not load VXL settings from \"${VXL_DIR}\" even through "
"ITK was built using VXL from this location."
)
ENDIF(VXL_FOUND)
ENDIF(VXL_FOUND)
ENDIF(ITK_USE_SYSTEM_VXL)
# Load settings from the system GDCM with which ITK was built, if any.
IF(ITK_USE_SYSTEM_GDCM)
# If GDCM has already been found, make sure it is the one used to
# build ITK.
IF(WIN32 OR APPLE)
STRING(TOLOWER "${GDCM_DIR}" ITK_CHECK_GDCM_DIR)
STRING(TOLOWER "${ITK_GDCM_DIR}" ITK_CHECK_ITK_GDCM_DIR)
ELSE(WIN32 OR APPLE)
SET(ITK_CHECK_GDCM_DIR "${GDCM_DIR}")
SET(ITK_CHECK_ITK_GDCM_DIR "${ITK_GDCM_DIR}")
ENDIF(WIN32 OR APPLE)
STRING(COMPARE EQUAL "${ITK_CHECK_GDCM_DIR}" "${ITK_CHECK_ITK_GDCM_DIR}"
ITK_GDCM_DIR_MATCH)
IF(GDCM_FOUND)
IF(NOT ITK_GDCM_DIR_MATCH)
MESSAGE(FATAL_ERROR
"ITK was built with GDCM from \"${ITK_GDCM_DIR}\", "
"but this project is using GDCM from \"${GDCM_DIR}\". "
"Please set GDCM_DIR to match the one used to build ITK."
)
ENDIF(NOT ITK_GDCM_DIR_MATCH)
ELSE(GDCM_FOUND)
IF(GDCM_DIR)
IF(NOT ITK_GDCM_DIR_MATCH)
MESSAGE(
"Warning: ITK was built with GDCM from \"${ITK_GDCM_DIR}\", "
"but this project has set GDCM_DIR to \"${GDCM_DIR}\". "
"ITK is changing GDCM_DIR to match the GDCM with which it was built."
)
ENDIF(NOT ITK_GDCM_DIR_MATCH)
ENDIF(GDCM_DIR)
SET(GDCM_DIR ${ITK_GDCM_DIR})
FIND_PACKAGE(GDCM)
IF(GDCM_FOUND)
INCLUDE(${GDCM_USE_FILE})
ELSE(GDCM_FOUND)
MESSAGE(FATAL_ERROR
"UseITK could not load GDCM settings from \"${GDCM_DIR}\" even through "
"ITK was built using GDCM from this location."
)
ENDIF(GDCM_FOUND)
ENDIF(GDCM_FOUND)
ENDIF(ITK_USE_SYSTEM_GDCM)
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