/* This program: */

#include <stdlib.h>
#include <string.h>

int main()
{
        char str[] = "MYVAR=Example";
        char *mem = malloc(sizeof(str));
        strcpy(mem, str);
        putenv(mem);
}

/* Produced output:

==4219== Memcheck, a memory error detector
==4219== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==4219== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info
==4219== Command: ./a.out
==4219==
==4219==
==4219== HEAP SUMMARY:
==4219==     in use at exit: 14 bytes in 1 blocks
==4219==   total heap usage: 2 allocs, 1 frees, 194 bytes allocated
==4219==
==4219== LEAK SUMMARY:
==4219==    definitely lost: 14 bytes in 1 blocks
==4219==    indirectly lost: 0 bytes in 0 blocks
==4219==      possibly lost: 0 bytes in 0 blocks
==4219==    still reachable: 0 bytes in 0 blocks
==4219==         suppressed: 0 bytes in 0 blocks
==4219== Rerun with --leak-check=full to see details of leaked memory
==4219==
==4219== For counts of detected and suppressed errors, rerun with: -v
==4219== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 13 from 8)
*/