sys/cdefs.h is an internal glibc header and should not be used about berkeley-db-1.xx

[pfalcon]

Did you try to report this to musl, that they aren't compatible with well-known software like BerkeleyDB?

I hope to get to building with musl eventually and see what should be done.

[alex-v77]

They are aware of the issues with sys/cdefs.h.

From their FAQ:

https://wiki.musl-libc.org/faq.html#Q:-When-compiling-something-against-musl,-I-get-error-messages-about-%3Ccode%3Esys/cdefs.h%3C/code%3E

"Q: When compiling something against musl, I get error messages about sys/cdefs.h"
[...]
"The bug is in the application that uses this internal glibc header. This header is not intended to be used by any program."

and in my opinion they're right, this header should not be used.

[pfalcon]

They're apparently wrong with at least one point - that it's internal glibc header, apparently it comes from BSD and/or SysV times.

Feel free to propose a patch, should be simple I guess. But please feel free to test with glibc, musl, newlib, uclibc, bionic. (Or somebody else might need to test.)