The current developer build of OS X -- 10.6.2 -- will not run on the Intel Atom processor commonly used in netbooks that ship with Windows or Linux, according to an account in Wired, attributing the report to a hacker named Stellarola.
"Apple appears to have changed around a lot of CPU-related information" in the build, says Stellarola. "One of the effects of this is Apple killing off Intel's Atom chip."
The software in question is only a developer build, and it still might change before Apple releases a real update.
With Apple refusing to release an affordable low-end mobile PC of its own, hacked netbooks from Dell and other manufacturers have been turning into an increasing popular alternative in the Macintosh community.