+ifneq ($(HAVE_SPHINX)$(HAVE_MAKEINFO),11)
+build-info:
+ @echo "Missing sphinx or makeinfo, not building info pages"
+else
+build-info: sphinx-info
+endif
+
+ifneq ($(HAVE_SPHINX)$(HAVE_MAKEINFO)$(HAVE_INSTALL_INFO),111)
+install-info:
+ @echo "Missing prerequisites, not installing info pages"
+else
+install-info: build-info
+ mkdir -m0755 -p "$(DESTDIR)$(infodir)"
+ install -m0644 $(INFO_INFO_FILES) $(DESTDIR)$(infodir)
+ for file in $(INFO_INFO_FILES); do install-info $$file $(DESTDIR)$(infodir)/dir; done
+endif
+