build.sh release failing currently

[Mark Davies <mark%mcs.vuw.ac.nz@localhost>]

Building the INSTALL_FLOPPY kernel (presumably all INSTALL kernels) fails 
currently with:

#      link  INSTALL_FLOPPY/netbsd
/local/SAVE/build.tools/bin/i386--netbsdelf-ld -Map 
netbsd.map --cref -T /local/src/src/sys/arch/i3
86/conf/kern.ldscript -Ttext c0100000 -e start -X -o netbsd ${SYSTEM_OBJ} 
${EXTRA_OBJ} vers.o
uipc_socket.o: In function `sogetopt':
uipc_socket.c:(.text+0x885): undefined reference to 
`do_getopt_accept_filter'
uipc_socket.o: In function `sosetopt':
uipc_socket.c:(.text+0xa26): undefined reference to 
`do_setopt_accept_filter'
uipc_socket.o: In function `sofree':
uipc_socket.c:(.text+0xf24): undefined reference to 
`do_setopt_accept_filter'
uipc_socket2.o: In function `sonewconn':
uipc_socket2.c:(.text+0x1162): undefined reference to 
`do_setopt_accept_filter'

*** Failed target:  netbsd

and therefore a build.sh release bails out.

cheers
mark