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While trying to build gdb on latest openSUSE Tumbleweed, I noticed the following warning, checking for makeinfo... makeinfo --split-size=5000000 configure: WARNING: *** Makeinfo is too old. Info documentation will not be built. then I checked the version of makeinfo, it said, ====== $ makeinfo --version texi2any (GNU texinfo) 7.0.1 Copyright (C) 2022 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. ====== After digging a little bit, it became quite obvious that a dot is missing in regexp that makes it impossible to match versions higher than 7.0, and here's the solution: - | egrep 'texinfo[^0-9]*(6\.[3-9]|[7-9][0-9])' >/dev/null 2>&1; then + | egrep 'texinfo[^0-9]*(6\.[3-9]|[7-9]\.[0-9])' >/dev/null 2>&1; then However, Eli pointed out that the solution above has another problem: it will stop working when Texinfo 10.1 will be released. Meanwhile, he suggested to solve this problem permanently. That is, we don't care about the minor version for Texinfo > 6.9, we only care about the major version. In this way, the problem will be resolved permanently, thanks to Eli. libctf/ChangeLog: * configure: Regenerated. * configure.ac: Update regexp to match versions higher than 7.0.