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### Running command:
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###   /Library/Frameworks/R.framework/Resources/bin/R CMD INSTALL gpart
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* installing to library ‘/Library/Frameworks/R.framework/Versions/4.1/Resources/library’
* installing *source* package ‘gpart’ ...
** using staged installation
** libs
clang++ -mmacosx-version-min=10.13 -std=gnu++14 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG  -I'/Library/Frameworks/R.framework/Versions/4.1/Resources/library/Rcpp/include' -I/usr/local/include   -fPIC  -Wall -g -O2  -c RcppExports.cpp -o RcppExports.o
clang++ -mmacosx-version-min=10.13 -std=gnu++14 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG  -I'/Library/Frameworks/R.framework/Versions/4.1/Resources/library/Rcpp/include' -I/usr/local/include   -fPIC  -Wall -g -O2  -c gpart_cpp.cpp -o gpart_cpp.o
gpart_cpp.cpp:622:42: error: use of undeclared identifier 'PI'
    solutions[1] = sq * cos(dxx + (2.0 * PI / 3.0)) - adiv3;
                                         ^
gpart_cpp.cpp:623:42: error: use of undeclared identifier 'PI'
    solutions[2] = sq * cos(dxx - (2.0 * PI / 3.0)) - adiv3;
                                         ^
2 errors generated.
make: *** [gpart_cpp.o] Error 1
ERROR: compilation failed for package ‘gpart’
* removing ‘/Library/Frameworks/R.framework/Versions/4.1/Resources/library/gpart’