Good evening, I was reading the m4 documentation you have posted at https://www.gnu.org/savannah-checkouts/gnu/m4/manual/m4-1.4.18/m4.html, and I noticed that there's a very minor bug with the included copy of the GPLv3 (in appendix A). The original GPLv3 text numbers its sections starting from 0, but your copy uses 1-based numbering, causing all cross-references to other sections to be off by one. (For instance, "You may convey a covered work in object code form under the terms of sections 4 and 5" at the beginning of the "Conveying Non-Source Forms" section should actually reference sections 5 and 6 by your renumbering.) The GFDL in appendix B also uses 1-based numbering, but I'm not familiar with it enough to determine if there are any similar off-by-one errors or not.
Please let me know if you need any further info. Best regards
