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I'm sorry, it should be more clear: that section refers to Lua 5.2 specifically.

It remains a slightly tricky problem with Lua 5.1, which can be solved
non-portably using shell tricks

My fault!
I've seen the section «what's new in 5.2», and thought «cool, i'll read this later. But for the moment, ctrl+f to find if popen is in the faq».

At least, that's a nice feature for Lua5.2 and an argument to switch :)