Author: Paolo Greppi <paolo.greppi@libpf.com>
Description: Do not install the info dir.gz file since that gets generated by something else

--- a/Makefile.in
+++ b/Makefile.in
@@ -210,10 +210,6 @@ install: installdirs html info pdf txt
 	$(POST_INSTALL)
 	$(INSTALL_DATA) $(INFOFILE) "$(DESTDIR)$(INFODIR)"
 	$(INSTALL_DATA) $(INFOFILE).gz "$(DESTDIR)$(INFODIR)"
-	if $(SHELL) -c "$(INSTINFO) --version" \
-	>/dev/null 2>&1; then \
-	$(INSTINFO) --dir-file="$(DESTDIR)$(INFODIR)/dir" "$(DESTDIR)$(INFODIR)/numdiff.info"; \
-	else true; fi
 
 install-nls: install
 	$(INSTALL_DATA) $(PACKAGE_IT).mo $(IT_LOC_DIR)/$(PACKAGE).mo