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From: Geoff Bull <geoff@research.canon.com.au>
Subject: Re: ada/c if - putenv?
Date: 2000/03/08
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Jeff Carter wrote:
> 
> Your program works fine as-is with GNAT 3.12p/Win98.
> 
> I don't know how putenv is supposed to work, but that Free in your
> Putenv procedure looks suspicious ...

Yes that's it.
man putenv gives this information:

     the string pointed to by  string
     becomes part of the environment, so altering the string will
     change the environment. 


...
     A potential error is to call the function  putenv()  with  a
     pointer to an automatic variable as the argument and to then
     exit the calling function while string is still part of  the
     environment.

And deallocating the string is equally a problem.

I've seen this answered here a few times over the years.

Cheers
Geoff