How to get rid of `grep: warning: GREP_OPTIONS is deprecated; please use an alias or script`?

I have zsh + zprezto installed on my Arch linux. Every time I open the console the annoying warning is being displayed:

grep: warning: GREP_OPTIONS is deprecated; please use an alias or script

Following the instructions in [SOLVED] grep: warning: GREP_OPTIONS is deprecated doesn't help. How can I get rid of this warning?

Solution

The following setting in ~/.zpreztorc caused the annoying warning message to be displayed:

zstyle ':prezto:*:*' color 'yes'

I just commented it out and it's fine now. The warning disappeared.

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