unknown type name "vsize_t"

[bch <brad.harder%gmail.com@localhost>]

In file included from /usr/src/tools/libctf/../compat/compat_defs.h:35:0,
                 from
/usr/src/obj/tooldir.NetBSD-7.99.26-amd64/include/compat/nbtool_config.h:720,
                 from
/usr/src/tools/libctf/../../external/cddl/osnet/dist/common/ctf/ctf_create.c:23:
/usr/src/tools/libctf/../../external/cddl/osnet/sys/sys/types.h:118:1:
error: unknown type name 'vsize_t'
 typedef vsize_t  pgcnt_t;
 ^