A new package has just been installed at tug.ctan.org and it should soon be at the mirror that you use.
Thank you for the upload, Jim Hefferon St Michael's College
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The following information was provided by the package's contributor.
Name of contribution: xifthen Author's name: Josselin Noirel Location on CTAN: /macros/latex/contrib/xifthen Summary description: Extended ifthen features License type: lppl
Announcement text given by the package's contributor: ---------------------------------------------------------------------- This package implements new commands to go within the first argument of ifthenelse to test whether a string is void or not, if a command is defined or equivalent to another. It includes also the possibility to make use of the complex expressions introduced by the package calc, together with the ability of defining new commands to handle complex tests. This package requires the e-TEX features. ----------------------------------------------------------------------
See this package at http://tug.ctan.org/tex-archive/macros/latex/contrib/xifthen . You may get a better network connection by using a CTAN mirror near to you; see http://tug.ctan.org/tex-archive/README.mirrors . Our service is supported by the TeX Users Group http://www.tug.org . Please join a users group; see http://www.tug.org/usergroups.html .