Now 8.pl needs to invoke 10.pl as a system command. Now, the problem is- M being loaded is from 5.8.8 module stack and not the system stack of 5.10.

Sorry, but that's not possible. A child process cannot see a variable in its parent process. There's no way a Perl 5.10 process sees the @INC of a Perl 5.8 process.

The problem is that you somehow told the Perl 5.10 process to use the Perl 5.8 lib dirs. Possible means of doing so:

In reply to Re: @INC array and two perl versions by ikegami
in thread @INC array and two perl versions by nikunjv

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