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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 ChemmineOB
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* checking for file ‘ChemmineOB/DESCRIPTION’ ... OK
* preparing ‘ChemmineOB’:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* running ‘cleanup’
* installing the package to build vignettes
      -----------------------------------
* installing *source* package ‘ChemmineOB’ ...
** using staged installation
checking for pkg-config... /opt/R/arm64/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for OPENBABEL... no
checking for OPENBABEL... no
checking for gcc... clang -arch arm64
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 clang -arch arm64 accepts -g... yes
checking for clang -arch arm64 option to accept ISO C89... none needed
checking how to run the C preprocessor... clang -arch arm64 -E
configure: creating ./config.status
config.status: creating src/Makevars
** 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/usr/include/openbabel3  -I/usr/include/eigen3  -DUSE_BOOST -DHAVE_EIGEN  -I/usr/local/include/eigen3 -I/usr/local/include/openbabel3    -I'/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/BH/include' -I'/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/Rcpp/include' -I'/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library/zlibbioc/include' -I/opt/R/arm64/include    -fPIC  -falign-functions=64 -Wall -g -O2   -c ChemmineOB.cpp -o ChemmineOB.o
ChemmineOB.cpp:1569:10: fatal error: 'openbabel/obutil.h' file not found
#include <openbabel/obutil.h>
         ^~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [ChemmineOB.o] Error 1
ERROR: compilation failed for package ‘ChemmineOB’
* removing ‘/private/var/folders/r0/l4fjk6cj5xj0j3brt4bplpl40000gt/T/RtmpGsAsjh/Rinst14868280f6e1f/ChemmineOB’
      -----------------------------------
ERROR: package installation failed