More context: https://www.postgresql.org/message-id/12717.1573846407%40sss.pgh.pa.us

Also include the possibility to include reports modifying existing external documentation.

In D24297#534619, @jbeich wrote:

Current version doesn't unbreak memalign consumers unless <malloc.h> has something like #define memalign aligned_alloc. If fixed then FreeBSD could take advantage of musl support in various projects. ;)
https://git.musl-libc.org/cgit/musl/tree/include/malloc.h?h=v1.2.0

This is not true implementation of memalign(3). memalign accepts any size argument, while both posix_memalign() and aligned_alloc() require size to be multiple of the alignment.

Looks OK. From my ports/ experience the header is often used when either <stdlib.h> is enough, for memalign or for malloc_usable_size.

I have been begging for this for years and strongly support.