WINDOWS

/* * Extract the "WINDOWS" flag from the compiler */     defined(__WIN32__) || defined(WIN32) || \ defined(__WINNT__) || defined(__NT__)
 * 1) if defined(_Windows) || defined(__WINDOWS__) || \
 * 1)  ifndef WINDOWS
 * 2)   define WINDOWS
 * 3)  endif
 * 4) endif

Value
undefined

Found in
h-basic.h