* installing *source* package ‘RVowpalWabbit’ ...
** package ‘RVowpalWabbit’ successfully unpacked and MD5 sums checked
** using non-staged installation via StagedInstall field
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... gcc -E
checking for R... yes
checking whether we are using the GNU C++ compiler... yes
checking whether clang++ -arch arm64 -std=gnu++14 accepts -g... yes
checking for boostlib >= 1.20.0... configure: We could not detect the boost libraries (version 1.20 or higher). If you have a staged boost library (still not installed) please specify $BOOST_ROOT in your environment and do not give a PATH to --with-boost option.  If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation.
checking whether the Boost::Program_Options library is available... no
configure: error: Please install the Boost program_options library.
ERROR: configuration failed for package ‘RVowpalWabbit’
* removing ‘/Volumes/Builds/packages/big-sur-arm64/results/4.1/RVowpalWabbit.Rcheck/RVowpalWabbit’