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autoconf：错误：可能未定义的宏：AC_LIBOBJ

给出以下autoconf片段：

if test x"$rsync_cv_HAVE_GETADDR_DEFINES" = x"yes" -a x"$ac_cv_type_struct_addrinfo" = x"yes"; then
    # Tru64 UNIX has getaddrinfo() but has it renamed in libc as
    # something else so we must include <netdb.h> to get the
    # redefinition.
    AC_CHECK_FUNCS(getaddrinfo, ,
            [AC_MSG_CHECKING([for getaddrinfo by including <netdb.h>])
            AC_TRY_LINK([#include <sys/types.h>
            #include <sys/socket.h>
            #include <netdb.h>],[getaddrinfo(NULL, NULL, NULL, NULL);],
                    [AC_MSG_RESULT([yes])
                    AC_DEFINE(HAVE_GETADDRINFO, 1,
                            [Define to 1 if you have the "getaddrinfo" function and required types.])],
                    [AC_MSG_RESULT([no])
                    AC_LIBOBJ([getaddrinfo])])])
else
    AC_LIBOBJ([getaddrinfo])
fi

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当运行一个autoconf或autoreconf -fi那个项目时，出现错误：