compiler macro that define operating system

Wed Sep 15 21:12:00 GMT 2010

                I am using gcc to compile a old peaice of code. that has so
many header file with 
#ifdef WIN_OS
#elseif UNIX_OS
   #error missing os

Now i am getting into this last statement time & again. I am not sure what
to define of that header file try compile UNIX_OS.  IS thier any standard
macro that I need to define in my makefile so that OS can be specifed.   Any
help is much appriatied

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