SET(CMAKE_SYSTEM_NAME Windows)
IF("${GNU_HOST}" STREQUAL "")
    SET(GNU_HOST i586-mingw32msvc)
ENDIF()
# Prefix detection only works with compiler id "GNU"
SET(CMAKE_C_COMPILER ${GNU_HOST}-gcc)
# CMake doesn't automatically look for prefixed 'windres', do it manually:
SET(CMAKE_RC_COMPILER ${GNU_HOST}-windres)