Just learned about this module and grepped for the wrong stuff.
All consumers use what is befined by devel/glib2.

OK?

Index: port-modules.5
===================================================================
RCS file: /cvs/src/share/man/man5/port-modules.5,v
diff -u -p -r1.270 port-modules.5
--- port-modules.5	11 Jul 2024 12:55:33 -0000	1.270
+++ port-modules.5	19 Jun 2025 20:39:58 -0000
@@ -604,8 +604,7 @@ This module is used by ports installing 
 .Pa ${PREFIX}/share/glib-2.0/schemas/ .
 It requires the following goo in the PLIST:
 .Bd -literal -offset indent
-@exec %D/bin/glib-compile-schemas %D/share/glib-2.0/schemas >/dev/null
-@unexec-delete %D/bin/glib-compile-schemas %D/share/glib-2.0/schemas >/dev/null
+@tag glib-compile-schemas
 .Ed
 .It devel/gconf2
 A link from