SOLVABLE_BLOCK
pool->solvables = solv_extend(pool->solvables, pool->nsolvables, 1, sizeof(Solvable), SOLVABLE_BLOCK);
pool->solvables = solv_extend(pool->solvables, pool->nsolvables, count, sizeof(Solvable), SOLVABLE_BLOCK);
pool->solvables = solv_extend_resize(0, 2, sizeof(Solvable), SOLVABLE_BLOCK);