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/usr/include/irssi/src/irc/core/ctcp.h is in irssi-dev 1.0.5-1ubuntu4.

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#ifndef __CTCP_H
#define __CTCP_H

/* Register/unregister CTCP command, so it shows in CTCP CLIENTINFO */
void ctcp_register(const char *name);
void ctcp_unregister(const char *name);

/* Send CTCP reply with flood protection */
void ctcp_send_reply(IRC_SERVER_REC *server, const char *data);

void ctcp_init(void);
void ctcp_deinit(void);

#endif