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@node environ
@section @code{environ}
@findex environ
POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/environ.html}
Gnulib module: environ
Portability problems fixed by Gnulib:
@itemize
@item
POSIX does not require this variable to be declared, and it is indeed not
declared on some platforms:
MacOS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, IRIX 6.5, Solaris 11 2010-11.
@item
On MacOS X 10, this variable is not declared. Up to MacOS X 10.4, one can use
@smallexample
extern char **environ;
@end smallexample
to get the variable declared. This does not work any more, however, in
shared libraries on MacOS X 10.5. Here is a workaround: Instead, one can use
@smallexample
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
@end smallexample
This works at all versions of MacOS X.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
The address of this variable is not a compile-time constant on some platforms:
mingw.
@end itemize
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