Hi everyone, This is a follow-up for a problem I encountered at the XAS08 PSI workshop, solved by Bruce, but it should probably be archived here in case anyone else discovers it. The Problem: Installation of Ifeffit and Horae following the build-from-source instructions [http://cars9.uchicago.edu/~ravel/software/downloads.html] appears to work, but Horae programs fail to start due to a missing "Ifeffit.pm" in "$prefix/lib/perl/...". You may at this point have copied Ifeffit.pm from the Ifeffit build tree, which at first seems to fix the problem. However, certain operations that require data to be copied between Perl/Horae and Ifeffit fail - in my case copying a group in Athena yields an apparently empty (or corrupt) group. This is reproducible for affected groups, but not all groups are affected. De-glitching is another test. The Solution: The Ifeffit Perl wrapper is apparently out-of-date. Bruce's Subversion repository contains an updated wrapper (libperlxray/Ifeffit) that fixes the problem, but hasn't been released as a source tarball yet - there are Subversion installation instructions at http://cars9.uchicago.edu/iffwiki/BruceRavel/EvolvingSoftware. Installation of the libperlxray/Ifeffit wrapper should be enough - you can use the release versions of the rest of Horae, but you may need Ifeffit 1.2.10a rather than 1.2.11b (more on this in another post). Anyway thanks to Bruce for figuring it out (and I hope my description isn't too inaccurate!) Gareth