if( MSYS )
  get_filename_component( msys_usr $ENV{WD} DIRECTORY )
  set( MSYS_USR_PATH ${msys_usr} CACHE INTERNAL "" )
endif( MSYS )

macro( msys_convert_path var path )
  if( MSYS )
    string( REGEX REPLACE ^/usr ${MSYS_USR_PATH} ${var} ${path} )
  else( MSYS )
    set( ${var} ${path} PARENT_SCOPE )
  endif( MSYS )
endmacro( )