our @EXPORT_OK = (@wpi_c_functions, @wpi_perl_functions);
our %EXPORT_TAGS;
 
$EXPORT_TAGS{wiringPi} = [@wpi_c_functions];
$EXPORT_TAGS{perl} = [@wpi_perl_functions];
$EXPORT_TAGS{all} = [@wpi_c_functions, @wpi_perl_functions];