purpose=

static VALUE
ossl_x509store_set_purpose(VALUE self, VALUE purpose)
{
#if (OPENSSL_VERSION_NUMBER >= 0x00907000L)
    X509_STORE *store;
    int p = NUM2INT(purpose);

    GetX509Store(self, store);
    X509_STORE_set_purpose(store, p);
#else
    rb_iv_set(self, "@purpose", purpose);
#endif

    return purpose;
}