libvmod-xkey build failure on 4.0

gistfile1.txt

vagrant@mediawiki-vagrant:/tmp/libvmod-xkey$ make
make  all-recursive
make[1]: Entering directory `/tmp/libvmod-xkey'
Making all in src
make[2]: Entering directory `/tmp/libvmod-xkey/src'
/usr/share/varnish/vmodtool.py ../src/vmod_xkey.vcc
make  all-am
make[3]: Entering directory `/tmp/libvmod-xkey/src'
/bin/bash ../libtool  --tag=CC   --mode=compile gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I..  -I/usr/include/varnish -Wall -Werror   -g -O2 -MT vcc_if.lo -MD -MP -MF .deps/vcc_if.Tpo -c -o vcc_if.lo vcc_if.c
libtool: compile:  gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I/usr/include/varnish -Wall -Werror -g -O2 -MT vcc_if.lo -MD -MP -MF .deps/vcc_if.Tpo -c vcc_if.c  -fPIC -DPIC -o .libs/vcc_if.o
libtool: compile:  gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I/usr/include/varnish -Wall -Werror -g -O2 -MT vcc_if.lo -MD -MP -MF .deps/vcc_if.Tpo -c vcc_if.c -o vcc_if.o >/dev/null 2>&1
mv -f .deps/vcc_if.Tpo .deps/vcc_if.Plo
/bin/bash ../libtool  --tag=CC   --mode=compile gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I..  -I/usr/include/varnish -Wall -Werror   -g -O2 -MT vmod_xkey.lo -MD -MP -MF .deps/vmod_xkey.Tpo -c -o vmod_xkey.lo vmod_xkey.c
libtool: compile:  gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I.. -I/usr/include/varnish -Wall -Werror -g -O2 -MT vmod_xkey.lo -MD -MP -MF .deps/vmod_xkey.Tpo -c vmod_xkey.c  -fPIC -DPIC -o .libs/vmod_xkey.o
vmod_xkey.c: In function ‘xkey_cb_insert’:
vmod_xkey.c:410:2: error: implicit declaration of function ‘HTTP_FOREACH_PACK’ [-Werror=implicit-function-declaration]
  HTTP_FOREACH_PACK(wrk, objcore, sp) {
  ^
vmod_xkey.c:410:38: error: expected ‘;’ before ‘{’ token
  HTTP_FOREACH_PACK(wrk, objcore, sp) {
                                      ^
vmod_xkey.c:404:14: error: unused variable ‘ep’ [-Werror=unused-variable]
  const char *ep, *sp;
              ^
vmod_xkey.c:403:13: error: unused variable ‘hdr_h2’ [-Werror=unused-variable]
  const char hdr_h2[] = "X-HashTwo:";
             ^
vmod_xkey.c:402:13: error: unused variable ‘hdr_xkey’ [-Werror=unused-variable]
  const char hdr_xkey[] = "xkey:";
             ^
vmod_xkey.c:401:16: error: unused variable ‘digest’ [-Werror=unused-variable]
  unsigned char digest[DIGEST_LEN];
                ^
vmod_xkey.c:400:13: error: unused variable ‘sha_ctx’ [-Werror=unused-variable]
  SHA256_CTX sha_ctx;
             ^
vmod_xkey.c: At top level:
vmod_xkey.c:455:10: error: ‘enum exp_event_e’ declared inside parameter list [-Werror]
     enum exp_event_e event, void *priv)
          ^
vmod_xkey.c:455:10: error: its scope is only this definition or declaration, which is probably not what you want [-Werror]
vmod_xkey.c:455:22: error: parameter 3 (‘event’) has incomplete type
     enum exp_event_e event, void *priv)
                      ^
vmod_xkey.c: In function ‘xkey_cb’:
vmod_xkey.c:464:7: error: ‘EXP_INSERT’ undeclared (first use in this function)
  case EXP_INSERT:
       ^
vmod_xkey.c:464:7: note: each undeclared identifier is reported only once for each function it appears in
vmod_xkey.c:465:7: error: ‘EXP_INJECT’ undeclared (first use in this function)
  case EXP_INJECT:
       ^
vmod_xkey.c:468:7: error: ‘EXP_REMOVE’ undeclared (first use in this function)
  case EXP_REMOVE:
       ^
vmod_xkey.c: In function ‘purge’:
vmod_xkey.c:508:18: error: ‘struct objcore’ has no member named ‘exp’
       oc->objcore->exp.ttl <= (ctx->now - oc->objcore->exp.t_origin))
                  ^
vmod_xkey.c:508:54: error: ‘struct objcore’ has no member named ‘exp’
       oc->objcore->exp.ttl <= (ctx->now - oc->objcore->exp.t_origin))
                                                      ^
vmod_xkey.c:512:19: error: ‘struct objcore’ has no member named ‘exp’
        oc->objcore->exp.grace, oc->objcore->exp.keep);
                   ^
vmod_xkey.c:512:43: error: ‘struct objcore’ has no member named ‘exp’
        oc->objcore->exp.grace, oc->objcore->exp.keep);
                                           ^
vmod_xkey.c:512:8: error: passing argument 1 of ‘EXP_Rearm’ from incompatible pointer type [-Werror]
        oc->objcore->exp.grace, oc->objcore->exp.keep);
        ^
In file included from vmod_xkey.c:35:0:
/usr/include/varnish/cache/cache.h:938:6: note: expected ‘struct object *’ but argument is of type ‘struct objcore *’
 void EXP_Rearm(struct object *o, double now, double ttl, double grace,
      ^
vmod_xkey.c:514:38: error: ‘struct objcore’ has no member named ‘exp’
    EXP_Rearm(oc->objcore, oc->objcore->exp.t_origin, 0,
                                      ^
vmod_xkey.c:515:8: error: passing argument 1 of ‘EXP_Rearm’ from incompatible pointer type [-Werror]
        0, 0);
        ^
In file included from vmod_xkey.c:35:0:
/usr/include/varnish/cache/cache.h:938:6: note: expected ‘struct object *’ but argument is of type ‘struct objcore *’
 void EXP_Rearm(struct object *o, double now, double ttl, double grace,
      ^
vmod_xkey.c: At top level:
vmod_xkey.c:535:50: error: ‘enum vcl_event_e’ declared inside parameter list [-Werror]
 vmod_event(VRT_CTX, struct vmod_priv *priv, enum vcl_event_e e)
                                                  ^
vmod_xkey.c:535:62: error: parameter 3 (‘e’) has incomplete type
 vmod_event(VRT_CTX, struct vmod_priv *priv, enum vcl_event_e e)
                                                              ^
vmod_xkey.c: In function ‘vmod_event’:
vmod_xkey.c:541:7: error: ‘VCL_EVENT_LOAD’ undeclared (first use in this function)
  case VCL_EVENT_LOAD:
       ^
vmod_xkey.c:545:8: error: implicit declaration of function ‘EXP_Register_Callback’ [-Werror=implicit-function-declaration]
        EXP_Register_Callback(xkey_cb, NULL);
        ^
vmod_xkey.c:551:7: error: ‘VCL_EVENT_DISCARD’ undeclared (first use in this function)
  case VCL_EVENT_DISCARD:
       ^
vmod_xkey.c:558:4: error: implicit declaration of function ‘EXP_Deregister_Callback’ [-Werror=implicit-function-declaration]
    EXP_Deregister_Callback(&xkey_cb_handle);
    ^
vmod_xkey.c: At top level:
vmod_xkey.c:300:1: error: ‘xkey_insert’ defined but not used [-Werror=unused-function]
 xkey_insert(struct objcore *objcore, const unsigned char *digest,
 ^
cc1: all warnings being treated as errors
make[3]: *** [vmod_xkey.lo] Error 1
make[3]: Leaving directory `/tmp/libvmod-xkey/src'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/tmp/libvmod-xkey/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/tmp/libvmod-xkey'
make: *** [all] Error 2