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I just checked, and man getaddrinfo shows that HPUX _does_
have getaddrinfo:

 getaddrinfo(3N)                                             getaddrinfo
(3N)

 NAME
      getaddrinfo(), getnameinfo(), freeaddrinfo(), gai_strerror
() - get
      hostname and address entry

 SYNOPSIS
      #include <sys/socket.h>
      #include <netdb.h>

      int getaddrinfo(const char *hostname, const char 
*servname,
                      const struct addrinfo *hints, struct addrinfo 
**res);

      int getnameinfo(const struct sockaddr *sa, size_t salen,
                      char *host, size_t hostlen,
                      char *serv, size_t servlen, int flags);

      void freeaddrinfo(struct addrinfo *ai);

      char *gai_strerror(int encode);
 
So the real problem is that configure didn't find it.