Ben Harris <bjh21@netbsd.org> writes:

>  * There are also "minor" feature-test macros, which enable extra
>  * functionality in addition to some base standard.  They should be
>  * defined along with one of the "major" macros.  The "minor" macros
>  * are:
>  *
>  * _REENTRANT
>  * _ISO_C99_SOURCE
>  * _LARGEFILE_SOURCE
>  */

Should it be clear which (set of) major macros each of these can go
with?

        - Nathan