Build fail on Fedora 31

[jerryd]

make[1]: Entering directory '/home/jerry/dev/tcp/libdill-2.14'
CC libdill_la-chan.lo
CC libdill_la-cr.lo
CC libdill_la-handle.lo
CC libdill_la-libdill.lo
CC libdill_la-now.lo
CC libdill_la-pollset.lo
CC libdill_la-rbtree.lo
CC libdill_la-stack.lo
CC libdill_la-ctx.lo
CC libdill_la-utils.lo
CC libdill_la-bsock.lo
CC libdill_la-fd.lo
CC libdill_la-happyeyeballs.lo
CC libdill_la-http.lo
CC libdill_la-iol.lo
CC libdill_la-ipc.lo
CC libdill_la-ipaddr.lo
In file included from ipaddr.c:44:
ipaddr.c: In function ‘dill_ipaddr_remotes’:
dns/dns.h:1009:24: error: lvalue required as unary ‘&’ operand
1009 | #define dns_opts(...) (&(dns_quietinit((struct dns_options)DNS_OPTS_INIT(VA_ARGS))))
| ^
ipaddr.c:335:47: note: in expansion of macro ‘dns_opts’
335 | dill_dns_hosts, dill_dns_hints, NULL, dns_opts(), &rc);
| ^~~~~~~~
make[1]: *** [Makefile:1785: libdill_la-ipaddr.lo] Error 1
make[1]: Leaving directory '/home/jerry/dev/tcp/libdill-2.14'
make: *** [Makefile:1926: all-recursive] Error 1
[jerry@amdr libdill-2.14]$ uname -a
Linux amdr 5.6.13-200.fc31.x86_64 #1 SMP Thu May 14 23:26:14 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

[jerryd]

gcc version 9.3.1 20200408 (Red Hat 9.3.1-2) (GCC)

[vincent-legoll]

duplicate of #191 ?