It's probably not valid on Linux but on OSes that support the functionality
you use to implement it. It might e.g. work on the Hurd that uses old
Linux networking code.
> It may be
> "bad style", but the test needs to exist _somewhere_. Besides, I've
> never been one to be convinced to do something purely based on
> stylistic arguments. Give me a real technical reason why it needs to
> be different and I'll consider changing it.
Checking for OSes is wrong because you couldn't care less for the
OS, you care for the functionality that is provided. This is the
nice idea behind autoconf (the implementation of autoconf is a completly
different issue, though).
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