https://bugs.openldap.org/show_bug.cgi?id=9485
--- Comment #11 from kloczko.tomasz@gmail.com kloczko.tomasz@gmail.com --- Just checked and only change related to autoconf is https://git.openldap.org/openldap/openldap/-/commit/5adcdb76 and that patch does not fix autoconf 2.71 issues. There is much more missing [] quites issues als all necessary dfixes ehen correctly implemented will be backward compatible even to autoconf 2.13.
BTW all files from build/ should be removed from git repo because those files are are added by "autoreconf -fiv" command. Any files added by that command should net be maintained in git repo and names oof those files should be added to .gitignore.