diff --git a/sysutils/pam_xdg/Makefile b/sysutils/pam_xdg/Makefile
index d8b7c2ac4f4a..b849c2f4110a 100644
--- a/sysutils/pam_xdg/Makefile
+++ b/sysutils/pam_xdg/Makefile
@@ -1,26 +1,30 @@
 PORTNAME=	pam_xdg
 DISTVERSION=	0.8.1
 CATEGORIES=	sysutils wayland
 MASTER_SITES=	https://ftp.sdaoden.eu/
 
 MAINTAINER=	jbeich@FreeBSD.org
 COMMENT=	PAM module to manage XDG Base Directories
 WWW=		https://www.sdaoden.eu/code.html#s-toolbox
 
 LICENSE=	ISCL
 
 USES=		uidfix
 PLIST_FILES=	lib/${PORTNAME}.so \
 		share/man/man8/${PORTNAME}.8.gz
 
+.if exists(/usr/lib/pam_xdg.so)
+IGNORE=		module name conflict with a different implementation in base system
+.endif
+
 # makefile is too crufty, so roll our own
 MAKEFILE=	bsd.lib.mk
 MAKE_ARGS+=	SHLIB_NAME="${PORTNAME}.so" MAN="${PORTNAME}.8" \
 		SRCS="${PORTNAME}.c" LDADD="-lpam" \
 		LIBDIR="${PREFIX}/lib" SHAREDIR="${PREFIX}/share"
 CFLAGS+=	-DXDG_CONFIG_DIR="${PREFIX}/etc" \
 		-DXDG_DATA_DIR_LOCAL="${PREFIX}" \
 		-DXDG_RUNTIME_DIR_OUTER="/var/run"
 LDFLAGS+=	-Wl,-z,defs
 
 .include <bsd.port.mk>