@INC is the result of all perllib additions that have been made by perl upon startup. It is not fixed at all. Although there is a portion of it that is fixed at compile time. The @INC is a combination of compile time settings, PERLLIB environment variable, perl command line -I parameters and use lib statements.
For example on linux, if you do:
PERLLIB=envbar perl -I cmdfoo -V -e "use lib ('usebaz');"
You will see the resulting @INC :
There appears to be an order of precidence here too. use lib is first, -I option is second, PERLLIB is third and compiled settings is fourth.
Update: added use lib to the example.
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