ref: e4322f4dffdea1ac61d67e2f0852982c65f5e98d dir: /src/execfs/builds/rules/
/index.html /cfg/$sysname/src/execfs/builds/index.rc /man2html/([0-9])/([a-zA-Z0-9\.]+) troff -manhtml /usr/build/code/plan9front/sys/man/\1/\2 | troff2html -t '\2(\1)'