ndim/so76847289

See https://stackoverflow.com/questions/76847289/makefile-am-how-to-list-all-files-of-specific-extension-in-foo-headers

Example code for answer to Stackoverflow question 76847289

See https://stackoverflow.com/questions/76847289/makefile-am-how-to-list-all-files-of-specific-extension-in-foo-headers