I have installed ChemmineOB and also open-babel but when the package is called inside R console, it seems that my open-babel is not found. Actually open-babel could be called by using its command line in terminal. I got confused and any suggestions will help a lot. 

Thank you so much. 

install open-babel

brew install open-babel

locate OPEN_BABEL_INCDIR and OPEN_BABEL_LIBDIR

OPEN_BABEL_INCDIR is /usr/local/Cellar/open-babel/2.3.2/lib/openbabel/2.3.2, where files likealias.h, descriptor.h, pointgroup.h, atom.h etc.

OPEN_BABEL_LIBDIR is /usr/local/Cellar/open-babel/2.3.2/lib/openbabel/2.3.2, where files likeAPIInterface.so, fastsearchformat.so, outformat.so, CSRformat.so, etc.

install ChemmineOB

R CMD INSTALL --configure-args='--with-openbabel-include=/usr/local/Cellar/open-babel/2.3.2/include/openbabel-2.0/openbabel --with-openbabel-lib=/usr/local/Cellar/open-babel/2.3.2/lib/openbabel/2.3.2' ChemmineOB_1.2.9.tgz

Errors reported

Error : .onLoad failed in loadNamespace() for 'ChemmineOB', details:
  call: dyn.load(file, DLLpath = DLLpath, ...)
  error: unable to load shared object '/Library/Frameworks/R.framework/Versions/3.1/Resources/library/ChemmineOB/libs/ChemmineOB.so': dlopen(/Library/Frameworks/R.framework/Versions/3.1/Resources/library/ChemmineOB/libs/ChemmineOB.so, 10): Symbol not found: __ZN9OpenBabel10FastSearch11FindSimilarEPNS_6OBBaseERSt8multimapIdjSt4lessIdESaISt4pairIKdjEEEdd
Referenced from: /Library/Frameworks/R.framework/Versions/3.1/Resources/library/ChemmineOB/libs/ChemmineOB.so
Expected in: /usr/local/lib/libopenbabel.4.dylib in /Library/Frameworks/R.framework/Versions/3.1/Resources/library/ChemmineOB/libs/ChemmineOB.so
Error: package or namespace load failed for ‘ChemmineOB’

Environment

R version 3.1.1 (2014-07-10) -- "Sock it to Me"

Platform: x86_64-apple-darwin13.1.0 (64-bit) Mac OS X 10.9.5

Xcode 6.0.1

I suggest you uninstall the brew-provided version of Open Babel and install it instead from here:

http://sourceforge.net/projects/openbabel/files/openbabel/2.3.1/OpenBabel-2.3.1.mac.zip/download

This is the version of Open Babel used by the Mac build machines at Bioconductor.

Then install ChemmineOB as follows:

source("http://bioconductor.org/biocLite.R")

biocLite("ChemmineOB")

That will install the binary version of ChemmineOB, which is already compiled. 

I just tried these steps on my own machine and they worked fine.

Dan

Wanted to provide updated guidance as it appears the SourceForge page for Open Babel has depreciated, and the Homebrew install was not working for me. I spent longer than I'd like to admit troubleshooting this on a Mac, but found using Conda was a quick fix once I understood the issue, that's also the recommended source by the Open Babel devs on GitHub. If you don't have admin access on your Mac, setting the environment variables OPEN_BABEL_INCDIR and OPEN_BABEL_LIBDIR to the respective install locations is the way to go if you're able to do that.

conda create -p usr/local/opt/open-babel 
conda activate /usr/local/opt/open-babel
conda install -c conda-forge openbabel

This installs Open Babel in the location expected by R/ChemmineOB with the correct formatting. Please note, I'm using ChemmineOB 1.3.2, Open Babel 3.1.1, Conda 4.11.0 and R 4.1.2