Avoid non-portable == for the test command The test command doesn't accept `==` as operator. It should be a single `=` for portable use. The `==` is a gnu extension. Note that the x-trick hasn't been needed for a long, long time. You can reliably write it with quotes: ``` if test "$gtk3" = yes; then ``` but I left that alone since it doesn't hurt other than being ugly.

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