ref: aa0b6bedf4151dffec81e38b3c166aaac51c04c1
dir: /sys/src/boot/mkfile/
ARCH=\ bcm\ bitsy\ efi\ pc\ reform\ zynq\ all:V: for(i in $ARCH)@{ cd $i mk } installall install:V: for(i in $ARCH) @{ cd $i mk install } clean:V: for(i in $ARCH) @{ cd $i mk clean }