int _mutt_system (const char *, int);
+pid_t mutt_create_filter (const char *, FILE **, FILE **, FILE **);
+pid_t mutt_create_filter_fd (const char *, FILE **, FILE **, FILE **, int,
+ int, int);
+int mutt_wait_filter (pid_t);
+
+
#endif /* MUTT_LIB_SYS_UNIX_H */