Every existing public library shall be considered to be established under this chapter, and the public library board of trustees and the governing body of the local governmental unit in which the library is located shall make any changes necessary to effect compliance with the terms of this chapter. Nothing contained in this chapter shall affect nor change the terms of any library contract executed prior to July 1, 1976, but, by mutual consent, the parties to such contract may nevertheless amend such contract to make it conform to any or all of the provisions of this chapter.
SDCL 14-2-28