Eliminate a few more groff(1) warnings.

share/doc/usd/13.viref/Makefile

@@ -5,23 +5,23 @@ VOLUME=	usd/13.viref
 SRCS=	vi.ref
 EXTRA=	ex.cmd.roff ref.so set.opt.roff vi.cmd.roff
 OBJS=	index.so
-MACROS=	-me
+MACROS=	-me -U
 CLEANFILES+=index index.so
 USE_SOELIM=	yes
 USE_SOELIMPP=	yes
 USE_TBL=	yes
 SRCDIR=	${.CURDIR}/../../../../contrib/nvi/docs/USD.doc/vi.ref
-TRFLAGS+=-U
 
 # Build index.so as a side-effect of building the paper.
 index.so: ${SRCS} ${EXTRA}
-	${SOELIMPP} -e 's:^\.so index.so$$::' ${SRCS:S;^;${SRCDIR}/;} | \
+	(cd ${SRCDIR}; ${SOELIMPP} -e 's:^\.so index.so$$::' ${SRCS}) | \
 	${ROFF} > /dev/null
-	sed -e 's/MINUSSIGN/\\-/' \
+	sed -e 's/MINUSSIGN/-/' \
 	    -e 's/DOUBLEQUOTE/""/' \
 	    -e "s/SQUOTE/'/" \
 	    -e 's/ /__SPACE/g' < index | \
 	sort -u '-t	' +0 -1 +1n | awk -f ${SRCDIR}/merge.awk | \
-	sed -e 's/__SPACE/ /g' > index.so
+	sed -e 's/__SPACE/ /g' \
+	    -e "s/^\\(['\\.]\\)/\\\\\&\\1/" > index.so 
 
 .include <bsd.doc.mk>