[CentOS] Widevine plugin for CentOS 6?

Does anyone know of a CentOS 6 compiled version of the widevine DRM plugin?

With Firefox 60ESR, Netflix (e.g.) installs a version in your ~/.mozilla/firefox/(profile name)gmp-widevinecdm/ directory but it has the following library failures in 'ldd' output:

ldd libwidevinecdm.so

./libwidevinecdm.so: /usr/lib64/libstdc++.so.6: version `CXXABI_1.3.5' not found (required by ./libwidevinecdm.so) ./libwidevinecdm.so: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by ./libwidevinecdm.so) ./libwidevinecdm.so: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by ./libwidevinecdm.so)