Latest 6.7p1 building failed on AIX 5.3

[Kai Cui]

Hi!

I try to build latest openssh 6.7p1 on AIX 5.3, but failed with the
following error msg:

# make
        echo

        (cd openbsd-compat && make)
Target "all" is up to date.
        cc -qlanglvl=extc89 -o ssh ssh.o readconf.o clientloop.o sshtty.o
 sshconnect.o sshconnect1.o sshconnect2.o mux.o  roaming_common.o
roaming_client.o -L. -Lopenbsd-compat/  -blibpath:/usr/lib:/lib -lssh
-lopenbsd-compat  -lcrypto -lz
ld: 0711-317 ERROR: Undefined symbol: .va_copy
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more
information.
make: The error code from the last command is 8.

Any help is appreciated.