add @INC directory

Hello, I have just upgrade my perl-5.8.8 to perl-5.10 , this new perl is installed at /usr/local/bin/perl
I have install a lot of modules in the old perl directory, so I have problem of using the new perl version because of many uninstalled module, should reinstalled all the modules that I need into the new perl directory or make my new perl @INC to include the @INC of the old perl ?

If appending the directory of old perl @INC to new perl @INC would just fine, how can I configure the @INC of new perl PERMANENTLY ?
Other than using "use lib @DIR"  ? I thought of using "export PER5LIB=...." , but not sure how to make it permanently all the time ? 

If it's better to reinstall the modules into the new perl directory, what are the good ways to uinstall modules that I have installed in the old perl directory ?


Thanks


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