「FVWM」

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M4 PREPROCESSING
M4 pre-processing is handled by a module in fvwm. To get more details, try man FvwmM4. In short, if you
want fvwm to parse your files with m4, then replace the command Read with FvwmM4 in your ~/.fvwm/config file
(if it appears at all), and start fvwm with the command

fvwm -cmd “FvwmM4 config”