/* Creates random centers using randomly selected cases from the data. */
static void
-kmeans_randomize_centers (struct Kmeans *kmeans, const struct casereader *reader, const struct qc *qc)
+kmeans_randomize_centers (struct Kmeans *kmeans, const struct casereader *reader UNUSED, const struct qc *qc)
{
int i, j;
for (i = 0; i < qc->ngroups; i++)