erlang @23.0 +wxwidgets: does not build on catalina

[logitab (Logitab)]

Build fails on macos 10.15.7

build started with:

port install erlang +wxwidgets

on

Xcode 12.0.1 / cc --version
Apple clang version 12.0.0 (clang-1200.0.32.2)

relevant part of log:

:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/erl_osenv.o
:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/erl_unix_sys_ddll.o
:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/erl_mtrace_sys_wrap.o
:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/erl_sys_common_misc.o
:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/erl_os_monotonic_time_extender.o
:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/erl_poll.flbk.o
:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/erlang_lttng.o
:info:build  CC obj/x86_64-apple-darwin19.6.0/opt/smp/inet_drv.o
:info:build drivers/common/inet_drv.c:1484:30: error: static declaration of 'in6addr_any' follows non-static declaration
:info:build static const struct in6_addr in6addr_any = { { IN6ADDR_ANY_INIT } };
:info:build                              ^
:info:build /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/netinet6/in6.h:211:30: note: previous declaration is here
:info:build extern const struct in6_addr in6addr_any;
:info:build                              ^
:info:build drivers/common/inet_drv.c:1493:30: error: static declaration of 'in6addr_loopback' follows non-static declaration
:info:build static const struct in6_addr in6addr_loopback =
:info:build                              ^
:info:build /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/netinet6/in6.h:212:30: note: previous declaration is here
:info:build extern const struct in6_addr in6addr_loopback;
:info:build                              ^
:info:build 2 errors generated.
:info:build make[4]: *** [obj/x86_64-apple-darwin19.6.0/opt/smp/inet_drv.o] Error 1
:info:build make[4]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_erlang/erlang/work/otp_src_23.0/erts/emulator'
:info:build make[3]: *** [opt] Error 2
:info:build make[3]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_erlang/erlang/work/otp_src_23.0/erts/emulator'
:info:build make[2]: *** [opt] Error 2
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_erlang/erlang/work/otp_src_23.0/erts'
:info:build make[1]: *** [smp] Error 2
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_erlang/erlang/work/otp_src_23.0/erts'
:info:build make: *** [emulator] Error 2
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_erlang/erlang/work/otp_src_23.0'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_erlang/erlang/work/otp_src_23.0" && /usr/bin/make -w all 
:info:build Exit code: 2

[ryandesign (Ryan Schmidt)]

Here is the upstream bug report: ​https://bugs.erlang.org/browse/ERL-1306

Here is the upstream PR that fixed it: ​https://github.com/erlang/otp/pull/2687