make release with i386 target now fails

I'm sure I did this yesterday without a failure; any hints as to what
broke/how to fix it?

	imb

===> tests/sys/cddl/zfs/tests/threadsappend (all)
===> tests/sys/cddl/zfs/tests/truncate (all)
===> usr.sbin/amd/libamu (all)
===> usr.sbin/audit (all)
===> tests/sys/cddl/zfs/tests/txg_integrity (all)
===> tests/sys/cddl/zfs/tests/userquota (all)
--- xdr_func_%undef.c ---
*** [xdr_func_%undef.c] Error code 1
make[5]: *** xdr_func_%undef.c removed

make[5]: stopped in
/usr/local/release-builds/i386/usr/src/usr.sbin/amd/libamu
.ERROR_TARGET='xdr_func_%undef.c'
.ERROR_META_FILE='/usr/local/release-builds/i386/tmp/obj/usr/local/release-builds/i386/usr/src/amd64.amd64/usr.sbin/amd/libamu/xdr_func_%undef.c.meta'
.MAKE.LEVEL='5'
MAKEFILE=''
.MAKE.MODE='meta missing-filemon=yes missing-meta=yes silent=yes'
_ERROR_CMD='unifdef -x1 -DHAVE_XDR_ATTRSTAT -DHAVE_XDR_CREATEARGS
-DHAVE_XDR_DIRLIST -DHAVE_XDR_DIROPARGS -DHAVE_XDR_DIROPOKRES
-DHAVE_XDR_DIROPRES -DHAVE_XDR_DIRPATH -DHAVE_XDR_ENTRY
-DHAVE_XDR_EXPORTNODE -DHAVE_XDR_EXPORTS -DHAVE_XDR_FATTR
-DHAVE_XDR_FHANDLE -DHAVE_XDR_FHSTATUS -DHAVE_XDR_FILENAME
-DHAVE_XDR_FTYPE -DHAVE_XDR_GROUPNODE -DHAVE_XDR_GROUPS
-DHAVE_XDR_LINKARGS -DHAVE_XDR_MOUNTBODY -DHAVE_XDR_MOUNTLIST
-DHAVE_XDR_NAME -DHAVE_XDR_NFS_FH -DHAVE_XDR_NFSCOOKIE
-DHAVE_XDR_NFSPATH -DHAVE_XDR_NFSSTAT -DHAVE_XDR_NFSTIME
-DHAVE_XDR_POINTER -DHAVE_XDR_READARGS -DHAVE_XDR_READDIRARGS
-DHAVE_XDR_READDIRRES -DHAVE_XDR_READLINKRES -DHAVE_XDR_READOKRES
-DHAVE_XDR_READRES -DHAVE_XDR_RENAMEARGS -DHAVE_XDR_SATTR
-DHAVE_XDR_SATTRARGS -DHAVE_XDR_STATFSOKRES -DHAVE_XDR_STATFSRES
-DHAVE_XDR_SYMLINKARGS -DHAVE_XDR_WRITEARGS -DHAVE_XDR_U_INT64_T -o
xdr_func_%undef.c
/usr/local/release-builds/i386/usr/src/contrib/amd/libamu/xdr_func.c;'