The Collaborative International Dictionary of English v.0.48:

Lack \Lack\, v. t. [imp. & p. p. Lacked (l[a^]kt); p. pr. &
   vb. n. Lacking.]
   1. To blame; to find fault with. [Obs.]
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            Love them and lakke them not.         --Piers
                                                  Plowman.
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   2. To be without or destitute of; to want; to need.
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            If any of you lack wisdom, let him ask of God.
                                                  --James i. 5.
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