>> I propose a method Process.fork_supported? which returns whether fork is supported on the current platform. See attached patch.
>
> Use Process.respond_to?(:fork).


I could add the method "OS.fork_supported?" to the OS gem if it would
help the original poster (and/or if it could help make unnecessary the
modification of respond_to? in 1.9.2)

Just thinking out loud.

-r