Changes to files in man/texi result in build errors for info files when using texinfo 4 because of empty links in node entries.  Specifically these are man/lispref/intro.texi (node Copying has missing prev and up links), node Introduction has missing next and up links), man/lispref/debugging.texi (node "Compilation Errors" has missing next link), and man/xemacs/custom.texi (node "Minor Modes" has missing next link).