Just to follow up on this thread, after a lengthy and detailed-filled off-line conversation with Isabelle, we managed to clear up several issues related to Demeter's build scripts. Isabelle was very patient and helpful. Several improvements have been checked into the github repository. Isabelle's initial question was about a failed installation somewhere deep in Demeter's tree of dependencies when installing on a Debian linux computer. In its build script, Demeter identifies a list of packages that it uses. Each of those packages has its own list of dependencies. One of Demeter's installation steps attempts to retrieve the entire tree of dependencies from the repository of Perl packages and build each one. In Isabelle's case, a couple of items deep in the dependency tree failed to install correctly. Demeter does not much care how these dependencies get resolved. In the case of Isabelle's Debian linux computer, she was able to use the Debian packaging system to meet the dependencies that, for some reason, did not install correctly using Demeter's build script. For example, one of the problems she ran into gave an error message that read, in part: Can't locate PerlIO/utf8_strict.pm in @INC It turns out that this package: https://metacpan.org/pod/PerlIO::utf8_strict was deep in the dependency tree. (Something called Config::INI is an immediate dependency of Demeter, PerlIO::utf8_strict is one of its dependencies.) In Debian, this package is called "libperlio-utf8-strict-perl". By installing the Debian package, she met Demeter's requirement. Many of the packages that Demeter's build script attempts to download and build could be installed in this way. The reason I am explaining all this is because this is a common sort of problem for those installing Demeter from source code. I wanted to leave this explanation in the m ailing list archives for the benefit of anyone in the future who runs into a similar snag. Cheers, B -- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Science Group at NSLS-II Building 535A Upton NY, 11973 Homepage: http://bruceravel.github.io/home/ Software: https://github.com/bruceravel Demeter: http://bruceravel.github.io/demeter/