root@gimli:/usr/ports/sysutils/openzfs # uname -a FreeBSD gimli 12.0-STABLE FreeBSD 12.0-STABLE r351102 GENERIC i386 root@gimli:/usr/ports/sysutils/openzfs # grep PORTVERSION Makefile PORTVERSION= 2019072200 root@gimli:/usr/ports/sysutils/openzfs # make [...] timestamp.c:54:26: error: format specifies type 'long' but the argument has type 'time_t' (aka 'int') [-Werror,-Wformat] (void) printf("%ld\n", t); ~~~ ^ %d 1 error generated. [...] ../../module/zfs/arc.c:7818:51: error: implicit conversion from 'unsigned long long' to 'unsigned long' changes value from 4294967296 to 0 [-Werror,-Wconstant-conversion] zfs_dirty_data_max_max = MIN(4ULL * 1024 * 1024 * 1024, ~ ~~~~~~~~~~~~~~~~~~~^~~~~~ /usr/include/sys/param.h:305:30: note: expanded from macro 'MIN' #define MIN(a,b) (((a)<(b))?(a):(b)) ^ 1 error generated.
I believe this is no longer an issue, please reopen if I am mistaken.