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lang-c
__WORDSIZEin my answer as well. Never use underscore in front of defines (unless you really know what you are doing) as they are (normally) reserved for the compiler. Also if you added a define like__WORDSIZE 16that would most likely be overruled by the compiler to 32. If you want to cross-compile 64-bit code on a 32-bit machine you would also need multilib. Note that this adds a lot of extra.