update building documentation
update building documentation

Ignore-this: 61bb8a116f5c0f2b78bc1ce8133715ef

darcs-hash:20090305033739-1a7c6-f4b2a7147e9993444c1840b27daeda282d6dcd92

kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc