make buildkernel fails after applying patch for FreeBSD-SA-18:01.ipsec. Kernel config is GENERIC with 'options IPSEC' added. The last output is below:

/usr/src/sys/netipsec/xform_ah.c:622:43: error: use of undeclared identifier
      'buf'
                    ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
                                                        ^
/usr/src/sys/netipsec/ipsec.h:323:51: note: expanded from macro 'DPRINTF'
#define DPRINTF(x)      do { if (V_ipsec_debug) printf x; } while (0)
                                                       ^
/usr/src/sys/netipsec/xform_ah.c:625:3: error: use of undeclared identifier
      'error'
                error = EACCES;
                ^
/usr/src/sys/netipsec/xform_ah.c:626:8: error: use of undeclared label 'bad'
                goto bad;
                     ^
3 errors generated.
*** Error code 1

Stop.