find/FindGeos.cmake

set(GEOS_PREFIX "" CACHE PATH "The path to the prefix of an Geos installation")

find_path(GEOS_INCLUDE_DIR NAMES geos_c.h
  PATHS
  ${GEOS_PREFIX}/include
  /opt/local/include
  /usr/include
  /usr/local/include
)

find_library(GEOS_LIBRARIES NAMES geos_c
  PATHS
  ${GEOS_PREFIX}/lib
  /opt/local/lib
  /usr/lib
  /usr/local/lib
)

find_path(GEOSPP_INCLUDE_DIR NAMES geos/constants.h
  PATHS
  ${GEOS_PREFIX}/include
  /opt/local/include
  /usr/include
  /usr/local/include
)

find_library(GEOSPP_LIBRARIES NAMES geos
  PATHS
  ${GEOS_PREFIX}/lib
  /opt/local/lib
  /usr/lib
  /usr/local/lib
)

if(GEOS_INCLUDE_DIR AND GEOS_LIBRARIES AND NOT TARGET GEOS)
  get_filename_component(GEOS_LIBRARY_DIR ${GEOS_LIBRARIES} PATH)
  set(GEOS_FOUND TRUE)
  add_library(Geos::Geos INTERFACE IMPORTED)
  set_target_properties(Geos::Geos PROPERTIES
      INTERFACE_INCLUDE_DIRECTORIES "${GEOS_INCLUDE_DIR}"
      INTERFACE_LINK_LIBRARIES "${GEOS_LIBRARIES}"
  )
endif()

if(GEOSPP_INCLUDE_DIR AND GEOSPP_LIBRARIES AND NOT TARGET GEOSPP)
  get_filename_component(GEOSPP_LIBRARY_DIR ${GEOSPP_LIBRARIES} PATH)
  set(GEOSPP_FOUND TRUE)
  add_library(Geos::GeosPP INTERFACE IMPORTED)
  set_target_properties(Geos::GeosPP PROPERTIES
      INTERFACE_INCLUDE_DIRECTORIES "${GEOSPP_INCLUDE_DIR}"
      INTERFACE_LINK_LIBRARIES "${GEOSPP_LIBRARIES}"
  )
endif()

if(GEOS_FOUND)
  if(NOT GEOS_FIND_QUIETLY)
    MESSAGE(STATUS "Found Geos: ${GEOS_LIBRARIES}")
  endif()
  set(HAVE_GEOS 1)
elseif(GEOS_FOUND)
  if(GEOS_FIND_REQUIRED)
    message(FATAL_ERROR "Could not find Geos")
  endif()
endif()

if(GEOSPP_FOUND)
  if(NOT GEOSP_FIND_QUIETLY)
    MESSAGE(STATUS "Found Geos++: ${GEOSPP_LIBRARIES}")
  endif()
  set(HAVE_GEOSPP 1)
elseif(GEOSPP_FOUND)
  if(GEOSPP_FIND_REQUIRED)
    message(FATAL_ERROR "Could not find Geos++")
  endif()
endif()