Build installs different "gmp.h" for 32- and 64-bit ABI's.

[Vincent Lefevre]

On 2009-06-23 13:49:38 +0200, Torbjorn Granlund wrote:
> Clearly, multi-ABI platforms need some provisions for handling multiple
> include files, or have a common set of include files that reliably
> detect the used ABI.

Under Mac OS X, MacPorts is able to unify the various gmp.h files,
e.g.

#ifndef __LP64__
#define GMP_LIMB_BITS                      32
#else /* __LP64__ */
#define GMP_LIMB_BITS                      64
#endif /* __LP64__ */

But IMHO, anything like that is platform-specific and may not be
always possible.

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