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/usr/include/postfix/get_hostname.h is in postfix-dev 2.11.0-1.

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#ifndef _GET_HOSTNAME_H_INCLUDED_
#define _GET_HOSTNAME_H_INCLUDED_

/*++
/* NAME
/*	get_hostname 3h
/* SUMMARY
/*	network name lookup
/* SYNOPSIS
/*	#include <get_hostname.h>
/* DESCRIPTION
/* .nf

 /* External interface */

extern const char *get_hostname(void);

/* LICENSE
/* .ad
/* .fi
/*	The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*	Wietse Venema
/*	IBM T.J. Watson Research
/*	P.O. Box 704
/*	Yorktown Heights, NY 10598, USA
/*--*/

#endif