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wikipedia:
*"x86-64* is a 64-bit <http://en.wikipedia.org/wiki/64-bit> superset <http://en.wikipedia.org/wiki/Superset> of the x86 instruction set architecture <http://en.wikipedia.org/wiki/X86_architecture>. The x86-64 instruction set natively supports Intel <http://en.wikipedia.org/wiki/Intel>'s x86 and was designed by Advanced Micro Devices <http://en.wikipedia.org/wiki/Advanced_Micro_Devices> (AMD), who have since renamed it *AMD64*. This architecture has been cloned by Intel under the name *Intel 64* (formerly known as *EM64T* among other names).^[1] <http://en.wikipedia.org/wiki/X86-64#_note-ewmppa> This leads to the common use of the names /x86-64/ or *x64* as more vendor-neutral terms to collectively refer to the two nearly identical implementations." 



Rob Kendrick wrote:

On Wed, 2008-02-06 at 11:06 +0100, Grellier, Thierry wrote:
Mike, problem is then to be able to build this x86_32 binary when you only 
have a x64 OS.


If using GCC on x86-64, can you not just pass -m32?  This seems to work
for me building Lua.  I've not tried LuaJIT.

Also, where does this apparently meaningless "x64" term come from?

B.