# uname -a
Linux nat 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26) x86_64 GNU/Linux


# make
make -C /lib/modules/4.19.0-8-amd64/build/ M=/usr/local/src/xt_NAT modules CONFIG_DEBUG_INFO=y                                                                                   
make[1]: Entering directory '/usr/src/linux-headers-4.19.0-8-amd64'
  CC [M]  /usr/local/src/xt_NAT/xt_NAT.o
/usr/local/src/xt_NAT/xt_NAT.c: In function ‘stat_seq_show’:
/usr/local/src/xt_NAT/xt_NAT.c:1547:43: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘s64’ {aka ‘long long int’} [-Wformat=]               
     seq_printf(m, "Active NAT sessions: %ld\n", atomic64_read(&sessions_active));
                                         ~~^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                         %lld
/usr/local/src/xt_NAT/xt_NAT.c:1548:42: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘s64’ {aka ‘long long int’} [-Wformat=]               
     seq_printf(m, "Tried NAT sessions: %ld\n", atomic64_read(&sessions_tried));
                                        ~~^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                        %lld
/usr/local/src/xt_NAT/xt_NAT.c:1549:44: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘s64’ {aka ‘long long int’} [-Wformat=]               
     seq_printf(m, "Created NAT sessions: %ld\n", atomic64_read(&sessions_created));
                                          ~~^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                          %lld
/usr/local/src/xt_NAT/xt_NAT.c:1550:41: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘s64’ {aka ‘long long int’} [-Wformat=]               
     seq_printf(m, "DNAT dropped pkts: %ld\n", atomic64_read(&dnat_dropped));
                                       ~~^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                       %lld
/usr/local/src/xt_NAT/xt_NAT.c:1551:39: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘s64’ {aka ‘long long int’} [-Wformat=]               
     seq_printf(m, "Fragmented pkts: %ld\n", atomic64_read(&frags));
                                     ~~^     ~~~~~~~~~~~~~~~~~~~~~
                                     %lld
/usr/local/src/xt_NAT/xt_NAT.c:1552:41: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘s64’ {aka ‘long long int’} [-Wformat=]               
     seq_printf(m, "Related ICMP pkts: %ld\n", atomic64_read(&related_icmp));
                                       ~~^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                       %lld
/usr/local/src/xt_NAT/xt_NAT.c:1553:36: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘s64’ {aka ‘long long int’} [-Wformat=]               
     seq_printf(m, "Active Users: %ld\n", atomic64_read(&users_active));
                                  ~~^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                  %lld
/usr/local/src/xt_NAT/xt_NAT.c: In function ‘nat_tg_init’:
/usr/local/src/xt_NAT/xt_NAT.c:1664:5: error: implicit declaration of function ‘setup_timer’; did you mean ‘sk_stop_timer’? [-Werror=implicit-function-declaration]              
     setup_timer( &sessions_cleanup_timer, sessions_cleanup_timer_callback, 0 );
     ^~~~~~~~~~~
     sk_stop_timer
cc1: some warnings being treated as errors
make[4]: *** [/usr/src/linux-headers-4.19.0-8-common/scripts/Makefile.build:315: /usr/local/src/xt_NAT/xt_NAT.o] Error 1                                                         
make[3]: *** [/usr/src/linux-headers-4.19.0-8-common/Makefile:1537: _module_/usr/local/src/xt_NAT] Error 2                                                                       
make[2]: *** [Makefile:146: sub-make] Error 2
make[1]: *** [Makefile:8: all] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.19.0-8-amd64'
make: *** [Makefile:11: xt_NAT.ko] Error 2