There's PDL configuration files: perldl.conf discussed in INSTALL and .perldl.conf discussed in FAQ - INSTALLATION that may be of help.

The latter has "Multiple PDL installs in the same PATH or @INC can cause puzzling test or build failures." which rather suggests this is a known issue.

-- Ken

In reply to Re: Getting CPAN.pm to accept Makefile.PL prompts by kcott
in thread Getting CPAN.pm to accept Makefile.PL prompts by syphilis

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