I don't know if pkgsrc is guaranteed to build on older -current's, but
in case it is, here is what I'm seeing:

lsof 4.68 build, -current jan 17, 2003

    cc -O2  -DNETBSDV=1060 -DHASGETBOOTFILE -DHASNFSPROTO -DHASIPv6 -DHASFDESCFS=1 -DHASFDLINK -DHASNULLFS -DHASPROCFS -DHASPROCFS_PFSROOT -DHASKERNFS -DHASKERNFS_KFS_KT -DHASNCVPID -DHASI_FFS -DHASEXT2FS -DHASNFSVATTRP -DUVM -I/var/obj/pkgsrc/sysutils/lsof/work/lsof_4.68/lsof_4.68_src/dialects/n+obsd/include -DHAS_UVM_INCL -DHAS_ADVLOCK_ARGS -DHASCWDINFO -DHAS_SYS_PIPEH -DLSOF_VSTR=\"1.6L\" -I/usr/include -I/sys -O  -DLSOF_MORE_SECURE=0  -DLSOF_LESS_SECURE_SOCKETS=0  -c dnode.c
    dnode.c: In function `process_node':
    dnode.c:403: structure has no member named `kfs_kt'
    dnode.c:409: structure has no member named `kfs_kt'
    dnode.c:410: structure has no member named `kfs_kt'
    dnode.c:862: `PFSroot' undeclared (first use in this function)
    dnode.c:862: (Each undeclared identifier is reported only once
    dnode.c:862: for each function it appears in.)
    dnode.c:863: `PFSproc' undeclared (first use in this function)
    dnode.c:867: `PFScurproc' undeclared (first use in this function)
    dnode.c:871: `PFSmem' undeclared (first use in this function)
    dnode.c:874: `PFSregs' undeclared (first use in this function)
    dnode.c:864: warning: unreachable code at beginning of switch statement
    dnode.c:1150: `PFSfile' undeclared (first use in this function)
    dnode.c:1165: `PFSfpregs' undeclared (first use in this function)
    dnode.c:1170: `PFSctl' undeclared (first use in this function)
    dnode.c:1175: `PFSstatus' undeclared (first use in this function)
    dnode.c:1180: `PFSnote' undeclared (first use in this function)
    dnode.c:1185: `PFSnotepg' undeclared (first use in this function)
    dnode.c:1138: warning: unreachable code at beginning of switch statement
    *** Error code 1

    Stop.
    make: stopped in /var/obj/pkgsrc/sysutils/lsof/work/lsof_4.68/lsof_4.68_src

FWIW: the previous lsof built without incident.

-wolfgang
-- 
Wolfgang S. Rupprecht 		     http://www.wsrcc.com/wolfgang/
           The From: address is valid.  Don't mess with it.