Pernanent disable comment next line

In a previous thread I read that I could disable automatically
commenting of the next line with:

:set formatoptions-=ro

This works, but I have to do it every time I open a file.
So on my Fedora 15_64 system, I added that set line to

/etc/vimrc

but it didn't work.

Any suggestions?
Thanks,
Mike.

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