“Apple is stonewalling open-source developers despite the
company’s recent release of much of the Mac OS X Tiger kernel
source code, according to Proclus, administrator of the GNU-Darwin
Distribution. ‘In order to have a free and open source (FOSS)
[operating] system, two things are necessary. First, all the
necessary source code must be obtainable by anyone, and second the
system must obviously be bootable in order to use it,’ Proclus told
MacNN. ‘Darwin OS is not bootable without the AppleACPIPlatform
driver, which is closed source [and proprietary] at this
time…'”