When i try to build to build the program in Win32, I get this error:

vanitygen.c(66): error C2057: expected constant expression
vanitygen.c(66): error c2466: cannot allocate an array of constant size 0
vanitygen.c(66): error c2133: 'ppnt': unknown size

The code is from:

vg_thread_loop(void *arg)
{
unsigned char hash_buf[128];
unsigned char *eckey_buf;
unsigned char hash1[32];

int i, c, len, output_interval;
int hash_len;

const BN_ULONG rekey_max = 10000000;
BN_ULONG npoints, rekey_at, nbatch;

vg_context_t *vcp = (vg_context_t *) arg;
EC_KEY *pkey = NULL;
const EC_GROUP *pgroup;
const EC_POINT *pgen;
const int ptarraysize = 256;
EC_POINT *ppnt[ptarraysize];

I haven't change anything in the code. How do I fix the errors?