On 26 Jun 2012, Timothy Pearson stated:
> but not /usr/include/ruby-1.9.1/i486-linux/.  You may need to pass
> /usr/include/ruby-1.9.1/i486-linux/ as an extra include directory to the
> build process.

Er, this is a variable (arch-dependent) string. e.g. on my system it is

/usr/include/ruby-1.9.1/x86_64-linux

Clearly the Ruby build system has some way of returning the include path
required to build programs that embed the Ruby interpreter. Looking at
some other program that embeds Ruby should make it clear what that is.
(I'd look, but it's mercilessly hot here and I haven't slept for days,
so I'm feeling decidedly lazy...)

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