Found the following significant warnings:
  Warning: unable to re-encode 'admnrev.R' lines 3, 5
  Warning: unable to re-encode 'affairs.R' line 3
  Warning: unable to re-encode 'alcohol.R' line 3
  Warning: unable to re-encode 'approval.R' line 3
  Warning: unable to re-encode 'athlet1.R' line 5
  Warning: unable to re-encode 'athlet2.R' line 5
  Warning: unable to re-encode 'audit.R' line 3
  Warning: unable to re-encode 'beauty.R' line 3
  Warning: unable to re-encode 'big9salary.R' lines 3, 5
  Warning: unable to re-encode 'bwght.R' line 3
  Warning: unable to re-encode 'campus.R' line 5
  Warning: unable to re-encode 'catholic.R' line 3
  Warning: unable to re-encode 'cement.R' lines 3, 5
  Warning: unable to re-encode 'corn.R' line 3
  Warning: unable to re-encode 'crime1.R' line 3
  Warning: unable to re-encode 'crime2.R' line 5
  Warning: unable to re-encode 'crime3.R' line 5
  Warning: unable to re-encode 'crime4.R' line 3
  Warning: unable to re-encode 'discrim.R' line 3
  Warning: unable to re-encode 'driving.R' line 3
  Warning: unable to re-encode 'elem94_95.R' line 3
  Warning: unable to re-encode 'engin.R' line 5
  Warning: unable to re-encode 'expendshares.R' lines 3, 5
  Warning: unable to re-encode 'ezanders.R' line 3
  Warning: unable to re-encode 'fair.R' lines 3, 5
  Warning: unable to re-encode 'fertil1.R' lines 3, 5
  Warning: unable to re-encode 'fertil2.R' lines 3, 5
  Warning: unable to re-encode 'fertil3.R' line 3
  Warning: unable to re-encode 'fish.R' line 3
  Warning: unable to re-encode 'fringe.R' lines 3, 5
  Warning: unable to re-encode 'gpa2.R' line 7
  Warning: unable to re-encode 'hprice1.R' line 5
  Warning: unable to re-encode 'hprice2.R' line 3
  Warning: unable to re-encode 'hseinv.R' line 3
  Warning: unable to re-encode 'htv.R' line 3
  Warning: unable to re-encode 'injury.R' line 3
  Warning: unable to re-encode 'intqrt.R' line 5
  Warning: unable to re-encode 'jtrain.R' line 3
  Warning: unable to re-encode 'jtrain2.R' line 3
  Warning: unable to re-encode 'jtrain3.R' line 3
  Warning: unable to re-encode 'k401k.R' line 3
  Warning: unable to re-encode 'k401ksubs.R' line 3
  Warning: unable to re-encode 'kielmc.R' line 3
  Warning: unable to re-encode 'loanapp.R' lines 3, 5
  Warning: unable to re-encode 'mathpnl.R' line 3
  Warning: unable to re-encode 'minwage.R' line 3
  Warning: unable to re-encode 'mroz.R' line 3
  Warning: unable to re-encode 'nbasal.R' line 3
  Warning: unable to re-encode 'openness.R' line 3
  Warning: unable to re-encode 'pension.R' line 3
  Warning: unable to re-encode 'pntsprd.R' line 5
  Warning: unable to re-encode 'prison.R' line 3
  Warning: unable to re-encode 'prminwge.R' line 3
  Warning: unable to re-encode 'recid.R' line 3
  Warning: unable to re-encode 'rental.R' line 3
  Warning: unable to re-encode 'return.R' line 5
  Warning: unable to re-encode 'sleep75.R' line 3
  Warning: unable to re-encode 'smoke.R' lines 3, 5
  Warning: unable to re-encode 'traffic2.R' lines 3, 5
  Warning: unable to re-encode 'twoyear.R' line 3
  Warning: unable to re-encode 'volat.R' line 3
  Warning: unable to re-encode 'voucher.R' lines 3, 5
  Warning: unable to re-encode 'wage1.R' line 5
  Warning: unable to re-encode 'wage2.R' line 3
  Warning: unable to re-encode 'wagepan.R' line 3
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/wooldridge.Rcheck/00install.out' for details.