Programming

#include <stdlib.h>
#include <stdio.h>
#include <complex.h>
#include <math.h>
#include <stdio.h>
#include <gsl/gsl_rng.h>

int main (void)
{
  const gsl_rng_type * T;
  gsl_rng * r;
     
  int i, n = 10;
     
  gsl_rng_env_setup();
     
  T = gsl_rng_default;
  r = gsl_rng_alloc (T);
     
  for (i = 0; i < n; i++) 
    {
      double u = gsl_rng_uniform (r);
      printf ("%.5f\n", u);
    }
     
  gsl_rng_free (r);
     
  return 0;
}

gcc -O3 random.c -lm -I/sw/include -L/sw/lib -lgsl -lgslcblas -o random.exe

ld: warning: directory not found for option '-L/sw/lib'
Undefined symbols for architecture x86_64:
  "_gsl_rng_env_setup", referenced from:
      _main in cc2FDGJF.o
  "_gsl_rng_default", referenced from:
      _main in cc2FDGJF.o
  "_gsl_rng_alloc", referenced from:
      _main in cc2FDGJF.o
  "_gsl_rng_uniform", referenced from:
      _main in cc2FDGJF.o
  "_gsl_rng_free", referenced from:
      _main in cc2FDGJF.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

ls -latr /sw/lib /sw/include

ls: /sw/include: No such file or directory
ls: /sw/lib: No such file or directory

/opt/local/include/gsl

gcc -O3 random.c -lm -I/opt/local/include -L/opt/local/lib -lgsl -lgslcblas -o random.exe