HAVE_IOCTLSOCKET_CAMEL_FIONBIO should get defined if IoctlSocket with FIONBIO is available, but the current check uses the (lowercase) ioctlsocket function, resulting in the same check that is done for HAVE_IOCTLSOCKET_FIONBIO.
But... Does this make sense? This doesn't really check that ioctlsocket supports the FIONBIO mode, but it just makes sure that the code compiles; so in reality this just checks if FIONBIO is defined, since the ioctlsocket check is already made when setting HAVE_IOCTLSOCKET. But maybe I'm missing something, I'm not really familiar with the Win32 API (or Amiga, since this seems the only system that has a camelcase IoctlSocket function).
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