farstream install fails on High Sierra, g-ir-scanner reports an unexpected -W option

[rsulliva]

reinstalled macports after High Sierra 10.13.2 upgrade (from Yosemite), following ​https://trac.macports.org/wiki/Migration steps to rebuild exported ports list

farstream is in myports.txt (of the migration steps) & fails to build. (other steps to this point seemed ok.)

on fail, macports last lines referred me to: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_comms_farstream/farstream/main.log (which is attached to this ticket)

see line 3909-3912 in main.log: an unexpected -W option is being passed to g-ir-scanner

tried ​https://trac.macports.org/wiki/FAQ#buildfails, specifically: port selfupdate & port clean which completed uneventfully.

can duplicate apart from the migration & rebuild steps with: sudo port install farstream

farstream version is: farstream-0.2.8_0.darwin_17

snip from main.log: ==================== :info:build CPPFLAGS="-I/opt/local/include" CFLAGS="-pipe -Os -arch x86_64" LDFLAGS="-L/opt/local/lib -Wl,-headerpad_max_install_names -arch x86_64" CC="/usr/bin/clang -arch x86_64" PKG_CONFIG="/opt/local/bin/pkg-config" DLLTOOL="false" /opt/local/bin/g-ir-scanner --namespace=Farstream --nsversion=0.2 --libtool="/bin/sh ../libtool" --include=GObject-2.0 --include=Gst-1.0 --library=libfarstream-0.2.la --symbol-prefix=fs --identifier-prefix=Fs --add-init-section="gst_init(NULL,NULL);" --pkg-export=farstream-0.2 --c-include=fs-candidate.h --c-include=fs-codec.h --c-include=fs-participant.h --c-include=fs-session.h --c-include=fs-stream.h --c-include=fs-conference.h --c-include=fs-utils.h --cflags-begin -I.. -I.. --cflags-end -L/opt/local/lib -lgstreamer-1.0 -lgobject-2.0 -lglib-2.0 -lintl -Wl,-framework -Wl,CoreFoundation fs-candidate.c fs-codec.c fs-participant.c fs-session.c fs-stream.c fs-conference.c fs-transmitter.c fs-stream-transmitter.c fs-plugin.c fs-element-added-notifier.c fs-utils.c fs-rtp.c fs-private.h fs-enumtypes.h fs-candidate.h fs-codec.h fs-participant.h fs-session.h fs-stream.h fs-conference.h fs-transmitter.h fs-stream-transmitter.h fs-plugin.h fs-element-added-notifier.h fs-utils.h fs-rtp.h libfarstream-0.2.la --output Farstream-0.2.gir

:info:build Usage: g-ir-scanner [options] sources :info:build g-ir-scanner: error: no such option: -W :info:build make[3]: * [Farstream-0.2.gir] Error 2