>>/  Date: Mon, 28 Nov 2011 16:36:25 +0100/
>>/  From: Mario Lassnig<address@hidden>/
>>/  /
>>/  The remedy (to include at the appropriate time and place):/
>>/  /
>>/  #include<crt_externs.h>/
>>/  #define environ (*_NSGetEnviron())/

>Is there really no system header on OS X that declares `environ'?  I'm
>surprised.

That's correct. And even system headers do it like this, probably
there's some magic in the background to work with ns-dragndrop and the likes.

Mario@shodan:/usr/include$ grep -r " environ " *
X11/Xw32defs.h:#  define environ     _environ
apache2/modperl_perl_includes.h:#   define environ (*_NSGetEnviron())
architecture/i386/fpu.h: *     #define environ (*_NSGetEnviron())

>If there really isn't, and we need to use #ifdef, I'm inclined to use
>"extern char **environ;".  What would be a MAC OS X specific symbol to
>use with such an ifdef?

That would be

#ifdef __APPLE__


Thanks,
Mario

-- 
Mario Lassnig
CERN PH-ADP-DDM 1-R-022
CH-1211 Geneve 23
mario.lassnig@cern.ch
+41 22 76 71268