I'm pretty sure that this Windows, not Perl, but I could be wrong.

In Windows, one has to close down the current command window and open a new one before environment variables are properly updated (unless you go through other hackery, but it's still not perfect).

After you delete the env var, open another command window and see if it still exists there.

In reply to Re: LibXML and %ENV in 5.18 on Windows by stevieb
in thread LibXML and %ENV in 5.18 on Windows by gweekly

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