Looked into the mutter failures, and it turns out they are fixed by using ports-gcc on base-gcc architectures.
ok? --Kurt Index: Makefile =================================================================== RCS file: /cvs/ports/x11/gnome/mutter/Makefile,v retrieving revision 1.102 diff -u -p -r1.102 Makefile --- Makefile 17 Feb 2020 18:58:34 -0000 1.102 +++ Makefile 25 Mar 2020 01:48:16 -0000 @@ -28,6 +28,9 @@ WANTLIB += gtk-3 intl json-glib-1.0 m pa WANTLIB += pangoft2-1.0 startup-notification-1 xcb xcb-randr xcb-res WANTLIB += xkbcommon xkbcommon-x11 xkbfile +COMPILER = base-clang ports-gcc +COMPILER_LANGS = c + MODULES= devel/dconf \ devel/meson \ x11/gnome