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Posh does not provide alternatives where a host platform does not offer a feature, but informs through preprocessor macros what is supported and what is not. It sets macros to assist in compiling with various compilers (such as GCC, MSVC and OpenWatcom), and different host endiannesses. In its simplest form, only a single header file is required. In the optional C source file, there are functions for byte swapping and in-memory serialisation/deserialisation.