If for 20 days after the first publication of the notice of award, the awardee fails, neglects, or refuses to execute a contract for the same, the board of supervisors may direct the clerk of the board to give notice as in the first instance, inviting sealed proposals or bids, and thereupon after receiving bids shall award the contract as in the first instance; and the said board shall proceed in the same manner in the case of the default of a second or subsequent awardee.