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It's a couple memes in one.

"I accidentally a word." is a meme

"He doesn't afraid of anything." is a meme

"Don't afraid of makefiles." combines the two and catches the eyes of those who know their memes.

The title a word.

The title what?

A word.

To answer you directly: It appears the author just forgot to include it.

Did you read the article? It's fairly clear that the author isn't a native speaker.

It looks like EGreg may also not be a native english speaker, from their own slight grammar error.

From the HN guidelines:

Please don't insinuate that someone hasn't read an article.

We may have been too hard on the GP, as I think he was just wondering whether it was accidental or the popular "doesn't afraid" meme.

Poe's law strikes again!