ref: 8ec7f79d03b498f2288221e32c4bc0f1ead4d8df
dir: /sys/src/libsec/amd64/mkfile/
objtype=amd64
</$objtype/mkfile
LIB=/$objtype/lib/libsec.a
FILES=\
chachablock\
md5block\
sha1block\
aesni\
HFILES=/sys/include/libsec.h
SFILES=${FILES:%=%.s}
OFILES=${FILES:%=%.$O}
UPDATE=mkfile\
$HFILES\
$SFILES\
</sys/src/cmd/mksyslib