spl-dkms fails to build on 4.9.6-1

  CC [M]  /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-kstat.o
  CC [M]  /var/lib/dkms/spl/0.6.5.8/build/module/splat/splat-cred.o
  CC [M]  /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-condvar.o
/var/lib/dkms/spl/0.6.5.8/build/module/splat/splat-cred.c: In function ‘splat_cred_test3’:
/var/lib/dkms/spl/0.6.5.8/build/module/splat/splat-cred.c:191:20: error: ‘NGROUPS_SMALL’ undeclared (first use in this function)
  gi = groups_alloc(NGROUPS_SMALL);
                    ^~~~~~~~~~~~~
/var/lib/dkms/spl/0.6.5.8/build/module/splat/splat-cred.c:191:20: note: each undeclared identifier is reported only once for each function it appears in
/var/lib/dkms/spl/0.6.5.8/build/module/splat/splat-cred.c:203:3: error: implicit declaration of function ‘GROUP_AT’ [-Werror=implicit-function-declaration]
   GROUP_AT(gi, i) = make_kgid(current_user_ns(), tmp_gid);
   ^~~~~~~~
/var/lib/dkms/spl/0.6.5.8/build/module/splat/splat-cred.c:203:19: error: lvalue required as left operand of assignment
   GROUP_AT(gi, i) = make_kgid(current_user_ns(), tmp_gid);
                   ^
cc1: some warnings being treated as errors
make[5]: *** [scripts/Makefile.build:293: /var/lib/dkms/spl/0.6.5.8/build/module/splat/splat-cred.o] Error 1
make[5]: *** Waiting for unfinished jobs....
  CC [M]  /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-xdr.o
make[4]: *** [scripts/Makefile.build:544: /var/lib/dkms/spl/0.6.5.8/build/module/splat] Error 2
make[4]: *** Waiting for unfinished jobs....
  CC [M]  /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.o
  CC [M]  /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-tsd.o
  CC [M]  /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-zlib.o
In file included from /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c:27:0:
/var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c: In function ‘cr_groups_search’:
/var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c:53:20: error: implicit declaration of function ‘GROUP_AT’ [-Werror=implicit-function-declaration]
       KGID_TO_SGID(GROUP_AT(group_info, mid));
                    ^
/var/lib/dkms/spl/0.6.5.8/build/include/sys/cred.h:52:38: note: in definition of macro ‘KGID_TO_SGID’
 #define KGID_TO_SGID(x)  (__kgid_val(x))
                                      ^
/var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c:53:20: error: incompatible type for argument 1 of ‘__kgid_val’
       KGID_TO_SGID(GROUP_AT(group_info, mid));
                    ^
/var/lib/dkms/spl/0.6.5.8/build/include/sys/cred.h:52:38: note: in definition of macro ‘KGID_TO_SGID’
 #define KGID_TO_SGID(x)  (__kgid_val(x))
                                      ^
In file included from ./include/linux/stat.h:19:0,
                 from ./include/linux/module.h:10,
                 from /var/lib/dkms/spl/0.6.5.8/build/include/sys/cred.h:28,
                 from /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c:27:
./include/linux/uidgid.h:38:21: note: expected ‘kgid_t {aka struct <anonymous>}’ but argument is of type ‘int’
 static inline gid_t __kgid_val(kgid_t gid)
                     ^~~~~~~~~~
In file included from /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c:27:0:
/var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c: In function ‘crgetgroups’:
/var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.c:107:26: error: ‘struct group_info’ has no member named ‘blocks’
  gids = KGIDP_TO_SGIDP(gi->blocks[0]);
                          ^
/var/lib/dkms/spl/0.6.5.8/build/include/sys/cred.h:55:30: note: in definition of macro ‘KGIDP_TO_SGIDP’
 #define KGIDP_TO_SGIDP(x) (&(x)->val)
                              ^
cc1: some warnings being treated as errors
make[5]: *** [scripts/Makefile.build:294: /var/lib/dkms/spl/0.6.5.8/build/module/spl/spl-cred.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [scripts/Makefile.build:544: /var/lib/dkms/spl/0.6.5.8/build/module/spl] Error 2
make[3]: *** [Makefile:1490: _module_/var/lib/dkms/spl/0.6.5.8/build/module] Error 2
make[3]: Leaving directory '/usr/lib/modules/4.9.6-1-ARCH/build'
make[2]: *** [Makefile:11: modules] Error 2
make[2]: Leaving directory '/var/lib/dkms/spl/0.6.5.8/build/module'
make[1]: *** [Makefile:588: all-recursive] Error 1
make[1]: Leaving directory '/var/lib/dkms/spl/0.6.5.8/build'
make: *** [Makefile:469: all] Error 2