install-stage-1-only: install-headers install-libdir-objects install-libs
install-stage-1-and-2: install-stage-1-only install-bin
install-gcc: install-stage-1-only
install-stage-1-only: install-headers install-libdir-objects install-libs
install-stage-1-and-2: install-stage-1-only install-bin
install-gcc: install-stage-1-only