Intrinsic define set by the compiler
Syntax
__FB_OPENBSD__
Description
Define without a value created at compile time in the OpenBSD version of the compiler, or when the 
-target openbsd command line option is used. It can be used to compile parts of the program only if the target is OpenBSD.
Example
#ifdef __FB_OPENBSD__
  '...instructions only for OpenBSD...
#else
  '...instructions not for OpenBSD...
#endif 
 Differences from QB
See also