In the cpan shell, if you want to build
PDL a step at a time, assuming you've
already installed all desired DEPENDENCIES
(maybe by installing the SciKarl package),
then you would do

   bash$ cpan
   cpan> get CHM/PDL-2.4.6_014.tar.gz       # get the latest dev release
   cpan> make CHM/PDL-2.4.6_014.tar.gz      # configure and build PDL
   cpan> test CHM/PDL-2.4.6_014.tar.gz      # run the test suite
   cpan> install CHM/PDL-2.4.6_014.tar.gz   # install if things worked

if you want to poke around by hand do

   cpan> look CHM/PDL-2.4.6_014.tar.gz

which will start up a shell in the build
directory that cpan was using.  To set the
cpan build directory, just use this
command at the cpan shell prompt:

   cpan> o conf init cpan_home


   The following questions are intended to help you with the
   configuration. The CPAN module needs a directory of its own to cache
   important index files and maybe keep a temporary mirror of CPAN files.
   This may be a site-wide or a personal directory.



   I see you already have a  directory
       /home/bad directory name/.cpan
   Shall we use it as the general CPAN build and cache directory?

    <cpan_home>
   CPAN build and cache directory? [/home/bad directory name/.cpan] 
/home/good_directory_name/.cpan



   Please remember to call 'o conf commit' to make the config permanent!
   cpan> o conf commit

Hope this helps.

--Chris




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