+ - **bash**: needed to run `make check`.
+ - **man** (manual pager): needed to view LTTng-tools commands' man
+ pages with the `--help` option or with the `lttng help` command.
+ Note that without `man`, you cannot get offline help with
+ LTTng-tools commands, not even their usage.
+ - **libpfm >= 4.0**: needed to run the perf regression test suite.
+ - Debian/Ubuntu package: `libpfm4-dev`