#include <stdio.h>
#include <stdlib.h>
extern char **environ;
char env1[] = "abc=def";
char *small_environ[] = { env1, 0 };
int
main (void)
{
  environ = small_environ;
  if (setenv ("mno", "pqr", 0) != 0)
    return perror ("setenv"), 1;
  env1[0] = 'x';
  if (! getenv ("xbc"))
    return fprintf (stderr, "getenv failed\n"), 1;
  return 0;
}