[Help-gsl] random number generator

[u4r07]

hi, attached is my program, i'm trying to get a file with lots of random 
numbers in
however when i try and change the seed there is a problem
i keep getting a compiling error message for the gsl function:

gsl_rng_set(const gsl_rng * r, s);

which is inside a for loop

the error message is:

visit.c: In function `main':
visit.c:27: parse error before `const'

[which is related to that function above]
can you help me please?
thanks
amy duffin