google-benchmark : Google's microbenchmark support library for C++ ( https://github.com/google/benchmark )
libmodbus : Modbus library which supports RTU communication over a serial line or a TCP link ( https://libmodbus.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a dev1990-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/dev1990-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org