-int parport_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num);
-int parport_open(int num);
-void parport_close(int handle);
+int __attribute__ ((visibility ("hidden"))) parport_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num);
+int __attribute__ ((visibility ("hidden"))) parport_open(int num);
+void __attribute__ ((visibility ("hidden"))) parport_close(int handle);