The linprocfs sources have moved to sys/compat/linprocfs.

sys/modules/linprocfs/Makefile

@@ -1,6 +1,6 @@
 # $FreeBSD$
 
-.PATH:	${.CURDIR}/../../i386/linux/linprocfs
+.PATH:	${.CURDIR}/../../compat/linprocfs
 KMOD=	linprocfs
 SRCS=	vnode_if.h linprocfs_misc.c linprocfs_subr.c \
 		linprocfs_vfsops.c linprocfs_vnops.c
@@ -8,4 +8,14 @@ NOMAN=
 VFS_KLD=
 CFLAGS+= -DLINPROCFS
 
+test: unload install load
+
+load:
+	kldload ${KMOD}
+	mount /compat/linux/proc
+
+unload:
+	-umount /compat/linux/proc
+	kldunload ${KMOD}
+
 .include <bsd.kmod.mk>