It's a good practice to avoid being root if you can. I just use sudo and get the same results with a safety net. You can either run the CPAN shell using sudo to install things or use sudo on the final install step for a manual install. 
perl Makefile.PL
make
make test
sudo make install

[download]
That will put the new modules in the places perl expects and make them available for everyone and you don't need to log in as root.

In reply to Re^3: How to change @INC permanently? by cbrandtbuffalo
in thread How to change @INC permanently? by spiritway

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