I have updated mysql from 5.1.73 to 5.6.21. Please download ant test on your favorite $ARCH

from your buildroot:

mv feeds/packages/utils/mysql/Makefile feeds/packages/utils/mysql/Makefile_old
mv feeds/packages/utils/mysql feeds/packages/utils/mysql_old

wget --no-check-certificate https://www.rossco.org/Files/OpenWrt/my … .21.tar.gz
tar -zxvf mysql_package-5.6.21.tar.gz

will replace original mysql Makefile and files.

make package/feeds/packages/mysql/compile V=s

# Add configuration options to replaced unused CONFIGURE_ARGS values
# fix /sys/sdt.h (build system) being detected as part of OpenWrt config
# trim out unused applications / files
# see if breaks other dependencies such as luci
# test on supported architectures: only x86_64 thus far

enjoy, please provide feedback, this thread