Avoid 'file names' with spaces

Makefile.org

@@ -595,6 +595,8 @@ install_docs:
 			>  $(INSTALL_PREFIX)$(MANDIR)/man$$sec/$$fn.$${sec}$(MANSUFFIX); \
 		$(PERL) util/extract-names.pl < $$i | \
 			grep -v $$filecase "^$$fn\$$" | \
+			grep -v "[	]" | \
+			grep -v "[	]" | \
 			(cd $(INSTALL_PREFIX)$(MANDIR)/man$$sec/; \
 			 while read n; do \
 				$$here/util/point.sh $$fn.$${sec}$(MANSUFFIX) "$$n".$${sec}$(MANSUFFIX); \