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/usr/include/x86_64-linux-gnu/lua5.2-deb-multiarch.h is in liblua5.2-dev 5.2.4-1ubuntu1.

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#ifndef _LUA_DEB_MULTIARCH_
#define _LUA_DEB_MULTIARCH_
#define DEB_HOST_MULTIARCH "x86_64-linux-gnu"
#endif