LTnfs requires a NFS filesystem in order to run.

--- lsof_4.91/tests/Makefile	2006-01-10 13:27:52.000000000 -0500
+++ lsof_4.91/tests/Makefile	2018-09-12 18:27:52.309560442 -0400
@@ -19,7 +19,7 @@
 
 BASTST=	LTbasic
 STDTST=	LTnlink LTsock LTszoff LTunix
-OPTTST=	LTbigf LTdnlc LTlock LTnfs 
+OPTTST=	LTbigf LTdnlc LTlock
 
 all:	${CKTSTDB} ${BASTST} ${STDTST} FRC
 	@./${CKTSTDB}; xv=$$?; \