cxxopts failing to build with clang11:
/build/source/src/include/external/cxxopts.hpp:488:42: error: no member named 'numeric_limits' in namespace 'std'
if (u > static_cast<U>(-std::numeric_limits<T>::min()))
Use the patch from upstream, which updates cxxopts 2.2.0 -> 3.0.0