Avoid deleting docs in old Emacs versions

* Makefile (maintainer-clean): Check minimum supported Emacs version before deleting docs, to ensure they can be regenerated.
5 years ago · 7ec3975c9a
parent c38b06fe24
commit 7ec3975c9a
1 changed files with 3 additions and 0 deletions
--- a/3
+++ b/3
@ -54,7 +54,10 @@ clean:
 	$(RM) $(ELCS)
 .PHONY: clean

+maintainer-clean: VER := 26
+maintainer-clean: MSG := Doc regeneration requires $(VER)+
 maintainer-clean: clean
+	$(BATCH) -eval '(if (< emacs-major-version $(VER)) (error "$(MSG)"))'
 	$(RM) $(DOCS)
 .PHONY: maintainer-clean