use top_srcdir, top_builddir, abs_top_srcdir or abs_top_builddir only if needed The build system runs primarily in the top-level directory now, so unless a Make rule changes the working directory before referencing a file, it is not necessary to use the abs_top_X or top_X directory names. * Makefile.am, build-aux/common.mk, doc/module.mk, libgui/graphics/module.mk, libgui/module.mk, libgui/src/module.mk, libinterp/corefcn/module.mk, libinterp/module.mk, liboctave/cruft/module.mk, liboctave/cruft/ranlib/module.mk, liboctave/module.mk, liboctave/numeric/module.mk liboctave/operators/module.mk, scripts/module.mk, src/module.mk: Only use Use $(top_srcdir), $(top_builddir), $(abs_top_srcdir), and $(abs_top_builddir) if necessary.

((nil .
      ((c-file-style . "gnu")
       (indent-tabs-mode . nil)
       (fill-column . 72)
       (eval . (when (and (buffer-file-name)
                          (string-match-p "\\.h\\'" (buffer-file-name))
                          (not (string-match-p "/gnulib/" (buffer-file-name))))
                 (c++-mode)
                 (c-set-style "gnu")))))
 (change-log-mode . ((indent-tabs-mode . t)))
 (makefile-mode . ((indent-tabs-mode . t))))