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Provide a target "bootstrap-libgcc", which will create the files src/gnu/lib/libgcc/${MACHINE_ARCH}.mk src/gnu/usr.bin/gcc/arch/${MACHINE_ARCH}/tconfig.h src/gnu/usr.bin/gcc/arch/${MACHINE_ARCH}/tm.h ...enough to allow libgcc to build so that a bootstrap build to DESTDIR can take place.