I'm having an issue where it seems recvmmsg/sendmmsg is being included into the c library regardless of kernel version.  I work with kernel versions < 2.6.33 before this feature was included. When compiling applications, autoconf is then mistakenly told from the c-library that recvmmsg/sendmmsg is supported by the kernel, resulting in runtime errors.  I use buildroot to compile my toolchains.

Looking through uclibc-ng git, it looks like this feature was added with this commit.
https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=6e15fafa20066634a58d412b259b117a47ca46d1


thanks,
Lance Fredrickson