[CMake] Forcing linking compatability to old libc / libstdc++ (Linux)

[Gonzalo Garramuño]

I currently own an Ubuntu Xenial 14.04.1 LTS box in which I do all my 
work.    I distribute a binary image viewer.   However, recently one of 
my users tried to run the viewer on a CentOS 7 distro and found out that 
that distro libc and libstdc++ are older and incompatible.

I would like to compile my program targeting the older libc and 
libstdc++.  Those files come with symbol version and visibility. Is 
there an easy way to do that other than copying the old libraries?

Any help or hint is appreciated.

-- 
Gonzalo Garramuño