This module requires a C compiler to build. To install the module, first edit libmd/mconf.h to suit your system (the default settings are for Linux/Win32). Then execute the sequence perl Makefile.PL make make test make install If you do not have permission to install modules in the Perl site tree on your system, you can install this in your own library by perl Makefile.PL PREFIX=/home/me/perl \ INSTALLMAN1DIR=/home/me/man/man1 \ INSTALLMAN3DIR=/home/me/man/man3 make make test make install To use modules in this location, either set the PERL5LIB environment variable to include your private module directory, or else put use lib '/home/me/perl/path/to/lib'; at the top of your script. If you need to alter libmd/mconf.h to work on your system, I would be interested in knowing what settings were required, so as to make this configuration more portable. A Win32 ppm package, suitable for use with ActivePerl compatible Perl packages (builds 6xx) is available at http://theoryx5.uwinnipeg.ca/ppmpackages/ To install, within the ppm shell set the repository to http://theoryx5.uwinnipeg.ca/cgi-bin/ppmserver?urn:/PPMServer and then ppm> install Math-Cephes Randy Kobes