* installing *source* package ‘RVowpalWabbit’ ...
** package ‘RVowpalWabbit’ successfully unpacked and MD5 sums checked
** using staged installation
checking for gcc... clang -arch x86_64
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 the compiler supports GNU C... yes
checking whether clang -arch x86_64 accepts -g... yes
checking for clang -arch x86_64 option to enable C11 features... none needed
checking how to run the C preprocessor... clang -arch x86_64 -E
checking for R... yes
checking whether the compiler supports GNU C++... yes
checking whether clang++ -arch x86_64 -std=gnu++17 accepts -g... yes
checking for clang++ -arch x86_64 -std=gnu++17 option to enable C++11 features... none needed
checking for boostlib >= 1.20.0... yes
checking whether the Boost::Program_Options library is available... yes
configure: error: Could not find a version of the library!
ERROR: configuration failed for package ‘RVowpalWabbit’
* removing ‘/Volumes/Builds/packages/big-sur-x86_64/results/4.3/RVowpalWabbit.Rcheck/RVowpalWabbit’