m// is the "long hand" version of //, so the warning is probably referring to this: 
($ENV{HTTP_USER_AGENT} =~ /MSIE/)

[download]
If so, that would mean that $ENV{HTTP_USER_AGENT} isn't defined (i.e. you don't have an HTTP_USER_AGENT environment variable set.

As a side note, you're probably better off using IE conditional comments to work around explorer's crappy CSS implementation.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Unknown warnings/errors by Joost
in thread Unknown warnings/errors by kmullin5016

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