You need to do the unshift in a BEGIN block: 
    BEGIN {
        unshift @INC, "/temp/packdir";
    }

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This is necessary because use is a compile-term directive. From the use docs, you find that use Module is exactly equivalent to 
     BEGIN { require Module; import Module LIST; }

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In reply to Re: unshift onto @INC by btrott
in thread unshift onto @INC by PegLeg

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