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set(ENV_PATH "$ENV{PATH}")
foreach(path "/does_not_exist" "/include" "")
  unset(PrefixInPATH_File CACHE)
  set(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}${path}")
  find_file(PrefixInPATH_File NAMES PrefixInPATH.h)
  message(STATUS "PrefixInPATH_File='${PrefixInPATH_File}'")
endforeach()

set(CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH OFF)
foreach(path "/does_not_exist" "/include" "")
  unset(PrefixInPATH_File CACHE)
  set(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}${path}")
  find_file(PrefixInPATH_File NAMES PrefixInPATH.h)
  message(STATUS "PrefixInPATH_File='${PrefixInPATH_File}'")
endforeach()

set(CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH ON)
foreach(path "/does_not_exist" "/include" "")
  unset(PrefixInPATH_File CACHE)
  set(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}${path}")
  find_file(PrefixInPATH_File NAMES PrefixInPATH.h NO_SYSTEM_ENVIRONMENT_PATH)
  message(STATUS "PrefixInPATH_File='${PrefixInPATH_File}'")
endforeach()
set(ENV{PATH} "${ENV_PATH}")