As was described in the release notes for version 1.4, I plan to remove the Makefile soon and make Meson the only supported buildsystem for flashrom: the proposed change is https://review.coreboot.org/c/flashrom/+/83673

If you haven't tried using meson before, now would be a good time to try and ensure your preferred workflow is still supported. If something you depend on doesn't work with meson, I'd love to hear about it so we can try to continue supporting it. Otherwise, I expect we'll be merging the above change within a few weeks to make good on our promise of removing support for building with make.