`apparmor.d` supports build directives, they are processed at build time of the project, when running `make`. They are valid apparmor comment, therefore, `apparmor_parser` can be used on a profile even if the directives have not been processed. They should not end with a comma. Multiline directive is not supported.
The `only` and `exclude` directives can be used to filter individual rule or rule paragraph depending on the target distribution of distribution family.
The `exec` directive is useful to allow executing transition to a profile without having to manage the possible long list of profile attachment (it varies depending on the distribution). The directive parse and resolve the attachment variable (`@{exec_path}`) of the target profile and include it in the current profile.
[Stacked](https://gitlab.com/apparmor/apparmor/-/wikis/AppArmorStacking) profiles can be hard to maintain. The *parent* profile needs to manage its own rules as well as always include the stacked profile rules. This directive automatically include the stacked profile rules into the parent profile.
