ref: 8d20cf86fb591c6cc1dc91dfca542cdb2a1fa14e
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