/* Source: http://www.gnu.org/s/gsl/manual/html_node/Random-number-environment-variables.html */

     #include <stdio.h>
     #include <gsl/gsl_rng.h>
     
     gsl_rng * r;  /* global generator */
     
     int
     main (void)
     {
       const gsl_rng_type * T;
     
       // gsl_rng_env_setup();
     
       T = gsl_rng_default;
       r = gsl_rng_alloc (T);
       
       printf ("generator type: %s\n", gsl_rng_name (r));
       printf ("seed = %lu\n", gsl_rng_default_seed);
       printf ("first value = %lu\n", gsl_rng_get (r));
     
       gsl_rng_free (r);
       return 0;
     }