+PORT f_lambda portp port?
+PORT f_lambda port_openp port-open?
+PORT f_lambda open_input_file open-input-file
+PORT f_lambda open_output_file open-output-file
+PORT f_lambda close_port close-port
+PORT f_lambda current_input_port current-input-port
+PORT f_lambda current_output_port current-output-port
+PORT f_lambda current_error_port current-error-port
+POSIX f_lambda command_line command-line
+POSIX f_lambda get_environment_variables get-environment-variables
+POSIX f_lambda get_environment_variable get-environment-variable
+POSIX f_lambda file_existsp file-exists?
+POSIX f_lambda delete_file delete-file
+POSIX f_lambda current_second current-second
+UNDEF f_lambda undef