I am a new user of autodock3. when running "gpf3gen" script on the example file "xk2a.pdbq" I get the error massage: "gpf3gen[19]: usr/bin/nawk: arg list too long. " I am using sgi Octane machine (IRIX64). Do you know what can I do about it? thanks Tzvika Aviv e-mail: tzvika_a ^at^ md.huji.ac.il at the Pharmacy School Hebrew University Jerusalem