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/usr/include/libpurple/dbus-useful.h is in libpurple-dev 1:2.12.0-1ubuntu4.

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#include "conversation.h"

PurpleAccount *purple_accounts_find_ext(const char *name, const char *protocol_id,
				    gboolean (*account_test)(const PurpleAccount *account));

PurpleAccount *purple_accounts_find_any(const char *name, const char *protocol);

PurpleAccount *purple_accounts_find_connected(const char *name, const char *protocol);