OpenZFS port compile error

[Patrick M. Hausen]

Hi all,

root at gimli:/usr/ports/sysutils/openzfs # uname -a
FreeBSD gimli 12.0-STABLE FreeBSD 12.0-STABLE r351102 GENERIC  i386

root at gimli:/usr/ports/sysutils/openzfs # grep PORTVERSION Makefile 
PORTVERSION=    2019072200

root at 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.

Any hints greatly appreciated.

Thanks!
Patrick
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