xdg-user-dirs uses -std=gnu11 so this needs ports-gcc to build.

-- 
:wq Claudio

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/xdg-user-dirs/Makefile,v
diff -u -p -r1.23 Makefile
--- Makefile	22 Sep 2025 12:20:10 -0000	1.23
+++ Makefile	15 Nov 2025 13:02:21 -0000
@@ -18,6 +18,10 @@ WANTLIB += c iconv intl
 
 MODULES=		devel/meson
 
+# -std=gnu11
+COMILER_LANGS=		c
+COMPILER=		base-clang ports-gcc
+
 BUILD_DEPENDS=		devel/gettext,-tools
 
 # man pages