bad things happen if you improperly pass arguments.... I think I was confused because darwinxref takes "-b foo" but darwinbuild uses "-build=foo" # /usr/local/bin/darwinbuild -build 8A428 system_cmds *** Fetching Sources ... *** Installing Roots ... *** Installing Headers ... *** Copying Sources ... tar (child): /BuildRoot/Sources/8A428-system_cmds.tar.gz: Cannot open: No such file or directory tar (child): Error is not recoverable: exiting now tar: Child returned status 2 tar: Error exit delayed from previous errors *** Mounting special filesystems ... Mounting devfs ... ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++ BUILDING 8A428-system_cmds~1 on Sat Jul 9 22:55:26 PDT 2005 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++ Build configuration: Build host: shantonu-sens-powerbook-g4-12.local Build tool: make Build action: install Build number: -build ...