Is this a short between my headphones or someone else's? Severely abridged:

xiong@oz:/$ /lab/bin/cpanp
Can't locate DBIx/Simple.pm in @INC 
(@INC contains: /lab/lib/perl5 /lab/lib/perl5 .) 
at /lab/lib/perl5/CPANPLUS/Internals/Source/SQLite.pm line 13.
BEGIN failed--compilation aborted...
...
[MSG] Falling back to CPANPLUS::Internals::Source::Memory
...
CPAN Terminal> i DBIx::Simple

Installing DBIx::Simple (1.32)
Running [/lab/bin/perl /usr/bin/cpanp-run-perl /lab/cpanplus/5.10.1/bu
+ild/DBIx-Simple-1.32/Makefile.PL LIB=/lab/lib INSTALLMAN1DIR=/lab/man
+/man1 INSTALLMAN3DIR=/lab/man/man3]...
Warning: prerequisite DBI 1.21 not found.
...
[ERROR] Failed to install 'DBI' as prerequisite for 'DBIx::Simple'
...
Error installing 'DBIx::Simple'
[download]

So, I go around again:

CPAN Terminal> i DBI

Installing DBI (1.609)
*** Install log written to:
  /lab/cpanplus/install-logs/DBI-1.609-1267307676.log

Module 'DBI' installed successfully
No errors installing all modules

CPAN Terminal>
[download]

However, DBIx::Simple still won't install, and for exactly the same reasons.

Now, I realize that some DBD is required by DBI; but this isn't the reported failure point, is it? I can't tell if DBIx::Simple isn't demanding the correct dependencies; cpanp isn't looking in the same place for modules that it's building them into; or I'm seconds away from a duh moment.

On a minor note, as you see, I built development perl such that all modules should be stored in one path, which is somehow duplicated in @INC. Can I remove this duplication after the fact or should I care?

Update:

The install log contains:

[MSG] [Sat Feb 27 13:54:36 2010] Module 'DBI' already up to date, won'
+t install without force
[download]

ExtUtils::MakeMaker is up to date.

Still no joy.

Final update (this node is now dead):

The correct answer is duh. I have (as you see above) set up perl so that @INC contains only /lab/lib/perl5 (twice, annoyingly) and of course .. But I had configured cpanp to build into /lab/lib. As they might say on Fark, "erroyality ensues."