https://bugs.openldap.org/show_bug.cgi?id=10418
--- Comment #2 from hanspeter.dekoning@dekonsult.com --- I just discovered my machine was actually running v2.4.57. It was installed and running in a Docker container.
In that version `slapcat -o ldif_wrap=no` returned the usage info, and did not do anything. However, `slapcat -o ldif-wrap=no` returned the expected output.
Checking the documentation for versions 2.4, 2.5 and v2.6, apparently the option name was changed from `ldif-wrap` in v2.4 to `ldif_wrap` in v2.5. Quite confusing, since the other -o options, e.g. `syslog-level`, are keeping the hyphen naming convention (kebab-case).