One can modify @INC any time one pleases. Whether it's in a BEGIN block, or outside of it. However, for perl to find a module, the directory the module is to be found in should be added before perl goes looking for it. Considering that use is done at compile time, using a BEGIN (one which preceeds the use) is a simple way of enforcing @INC to be set in time.

Using require and postponing the use of a module to run time, obviously works as well.

Doesn't the snippet you gave work?

In reply to Re: dynamically expand @INC beyond BEGIN by JavaFan
in thread dynamically expand @INC beyond BEGIN by somekindafreak

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