ifneq ($(ARCH),x86_64)
    ifneq ($(ARCH),i386)
        ifneq ($(ARCH),axp)
            ifneq ($(OSTYPE),ppc)
                ifneq ($(OSTYPE),Darwin)
                    ifneq ($(ARCH),sparc)
                        $(error arch $(ARCH) is currently not supported)
                    endif
                endif
            endif
        endif
    endif
endif