Tried building module for PHP7.2 and PHP7.4 both complaining about missing config.m4:
$>phpize7.2
Cannot find config.m4.
Make sure that you run '/usr/bin/phpize7.2' in the top level source directory of the module
$>phpize7.4
Cannot find config.m4.
Make sure that you run '/usr/bin/phpize7.4' in the top level source directory of the module