[Libguestfs] rb_alloc_func_t undeclared in ruby 1.8

[Richard W.M. Jones]

On Thu, Jan 03, 2013 at 03:23:43PM +0100, Olaf Hering wrote:
> 
> ruby bindings fail to build with ruby 1.8.7 because rb_alloc_func_t does
> not exist in this version of ruby. This happens due to commit
> 448a02373df95dafc0d4b3e4db0e77c96a09074d

That's annoying!  Also I couldn't work out how to fix it
easily.  The obvious

AC_CHECK_TYPE([rb_alloc_func_t], [], [], [[#include <ruby.h>]])

doesn't work because you have to add /usr/include/x86_64-linux to the
include path in order for <ruby/config.h> to be found (at least,
that's the case on Fedora).  The /usr/include/x86_64-linux path does
not seem to be mentioned anywhere in RbConfig::CONFIG.  It appears
that this path is hard-coded in mkmf.

Rich.

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