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### Running command:
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###   /Library/Frameworks/R.framework/Resources/bin/R CMD build --keep-empty-dirs --no-resave-data CGEN
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* checking for file ‘CGEN/DESCRIPTION’ ... OK
* preparing ‘CGEN’:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to build vignettes
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* installing *source* package ‘CGEN’ ...
** using staged installation
** libs
clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/opt/R/arm64/include   -fPIC  -falign-functions=64 -Wall -g -O2  -c Additive.c -o Additive.o
clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/opt/R/arm64/include   -fPIC  -falign-functions=64 -Wall -g -O2  -c CML.c -o CML.o
clang -arch arm64 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/opt/R/arm64/include   -fPIC  -falign-functions=64 -Wall -g -O2  -c ccl.c -o ccl.o
ccl.c:430:16: warning: variable 'det' set but not used [-Wunused-but-set-variable]
        double temp , det = 1.0 ;
                      ^
1 warning generated.
/opt/R/arm64/bin/gfortran -mtune=native -fno-optimize-sibling-calls  -fPIC  -Wall -g -O2  -c csclust.f -o csclust.o
make: /opt/R/arm64/bin/gfortran: No such file or directory
make: *** [csclust.o] Error 1
ERROR: compilation failed for package ‘CGEN’
* removing ‘/private/tmp/RtmpaGbMpr/Rinst652b3c4066a4/CGEN’
      -----------------------------------
ERROR: package installation failed