x11/gnome/control-center uses C99 constructs so needs -std=gnu99 for base-gcc architectures.
ok? --Kurt Index: Makefile =================================================================== RCS file: /cvs/ports/x11/gnome/control-center/Makefile,v retrieving revision 1.59 diff -u -p -r1.59 Makefile --- Makefile 16 Feb 2020 09:55:42 -0000 1.59 +++ Makefile 28 Mar 2020 02:47:57 -0000 @@ -25,6 +25,8 @@ MODULES= devel/meson \ security/heimdal \ x11/gnome +CFLAGS= -std=gnu99 + LIB_DEPENDS= audio/gsound \ audio/pulseaudio \ devel/libgtop2 \