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### Running command:
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###   /Library/Frameworks/R.framework/Resources/bin/R CMD INSTALL eiR
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* installing to library ‘/Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library’
* installing *source* package ‘eiR’ ...
** using staged installation
** libs
using C++ compiler: ‘Apple clang version 15.0.0 (clang-1500.1.0.2.5)’
using SDK: ‘MacOSX11.3.sdk’
clang++ -arch arm64 -std=gnu++17 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/opt/R/arm64/include    -fPIC  -falign-functions=64 -Wall -g -O2  -DR_NO_REMAP -c optimFunctions.cc -o optimFunctions.o
optimFunctions.cc:40:10: error: use of undeclared identifier 'length'
        int k = length(xS); //length of result vector
                ^
optimFunctions.cc:41:10: error: use of undeclared identifier 'length'
        int m = length(dS); //length of distance vector
                ^
optimFunctions.cc:91:24: error: use of undeclared identifier 'allocVector'; did you mean 'Rf_allocVector'?
        SEXP result = PROTECT(allocVector(REALSXP, 1));
                              ^~~~~~~~~~~
                              Rf_allocVector
/Library/Frameworks/R.framework/Resources/include/Rinternals.h:388:31: note: expanded from macro 'PROTECT'
#define PROTECT(s)      Rf_protect(s)
                                   ^
/Library/Frameworks/R.framework/Resources/include/Rinternals.h:1078:10: note: 'Rf_allocVector' declared here
SEXP     Rf_allocVector(SEXPTYPE, R_xlen_t);
         ^
optimFunctions.cc:99:10: error: use of undeclared identifier 'length'
        int k = length(xS); //length of result vector
                ^
optimFunctions.cc:100:10: error: use of undeclared identifier 'length'
        int m = length(dS); //length distance vector
                ^
optimFunctions.cc:102:24: error: use of undeclared identifier 'allocVector'; did you mean 'Rf_allocVector'?
        SEXP result = PROTECT(allocVector(REALSXP, k));
                              ^~~~~~~~~~~
                              Rf_allocVector
/Library/Frameworks/R.framework/Resources/include/Rinternals.h:388:31: note: expanded from macro 'PROTECT'
#define PROTECT(s)      Rf_protect(s)
                                   ^
/Library/Frameworks/R.framework/Resources/include/Rinternals.h:1078:10: note: 'Rf_allocVector' declared here
SEXP     Rf_allocVector(SEXPTYPE, R_xlen_t);
         ^
6 errors generated.
make: *** [optimFunctions.o] Error 1
ERROR: compilation failed for package ‘eiR’
* removing ‘/Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library/eiR’