Index: vim-8.2.2411/runtime/doc/Makefile
===================================================================
--- vim-8.2.2411.orig/runtime/doc/Makefile
+++ vim-8.2.2411/runtime/doc/Makefile
@@ -331,6 +331,7 @@ CONVERTED = \
 all: tags vim.man evim.man vimdiff.man vimtutor.man xxd.man $(CONVERTED)
 
 # Use Vim to generate the tags file.  Can only be used when Vim has been
+	export VIMRUNTIME=../; \
 # compiled and installed.  Supports multiple languages.
 vimtags: $(DOCS)
 	@$(VIMEXE) --clean -esX -V1 -u doctags.vim