cmake_host_system_information(RESULT result QUERY MSYSTEM_PREFIX)
message(STATUS "MSYSTEM_PREFIX='${result}'")
if(CMake_TEST_MSYSTEM_PREFIX)
  if(NOT "${result}" STREQUAL "${CMake_TEST_MSYSTEM_PREFIX}")
    message(FATAL_ERROR "Actual result:\n ${result}\nis not expected result:\n ${CMake_TEST_MSYSTEM_PREFIX}")
  endif()
endif()