Changes in version 2.1.1 (2021-12-15)                  

Bug Fixes

  - Updated src/Makevars.in to require C++14 (CXX_STD = CXX14) to comply
    with the minimum standard now enforced by RcppArmadillo. Fixes
    compilation errors on systems with recent versions of RcppArmadillo
    that require C++14 or later.