# Inconsistent definition of _OCC64 on Linux/AMD64

Greetings,

After compiling OCC on Linux/AMD64 (specifically, Debian unstable using my packages), UndefinedHandleAddress is defined as its 64-bit version in the libraries. Unfortunately, Standard_Macro.hxx does not define it while compiling a new binary, so there is an inconsistent UndefinedHandleAddress due presumably to the inconsistent definition of _OCC64.