Reading the documention at http://gcc.gnu.org/install/build.html I see that "make bootstrap-lean" is mentioned and it no longer works after the toplevel bootstrap.
[zhivago:combine/trunk/objdir1] pinskia% make bootstrap-lean make: *** No rule to make target `bootstrap-lean'. Stop. -- Summary: make bootstrap-lean no longer works Product: gcc Version: 4.2.0 Status: UNCONFIRMED Keywords: build Severity: blocker Priority: P3 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25452