The targets all, dvi, ps, pdf, html, clean, distclean, test, check, install, and uninstall are considered to be top-level targets as well as the targets defined in Section 28.10 and in Makefile.def.nw (or Makefile.def.allprose.nw if Makefile.def.nw does not exist).
Furthermore, it is assumed that the building process is called exclusively from within the PROJECTROOT directory.