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I am trying to use some code from OpenCV in an R package, using Rcpp to build the package. When I compile the c code on my machine, it works fine. For example, I am using the the following syntax locally to compile the facedetect.cpp code: g++ `pkg-config --cflags opencv` facedetect.cpp -o facedetect `pkg-config --libs opencv` However, when I try to include it in my package using the following command: R CMD SHLIB facedetect.cpp -o facedetect with the following defined in my makevars file: PKG_CPPFLAGS= `$(R_HOME)/bin/Rscript -e 'Rcpp:::CxxFlags()'` PKG_LIBS = `$(R_HOME)/bin/Rscript -e "Rcpp:::LdFlags()"` PKG_CXXFLAGS= `pkg-config --cflags opencv` `pkg-config --libs opencv` R executes the following: g++ -arch x86_64 -I/Library/Frameworks/R.framework/Resources/include -I/Library/Frameworks/R.framework/Resources/include/x86_64 `pkg-config --cflags opencv` `pkg-config --libs opencv` `/Library/Frameworks/R.framework/Resources/bin/Rscript -e 'Rcpp:::CxxFlags()'` -I/usr/local/include -fPIC -g -O2 -c facedetect.cpp -o facedetect.o which gives me the following error messages: i686-apple-darwin10-g++-4.2.1: -lopencv_core: linker input file unused because linking not done i686-apple-darwin10-g++-4.2.1: -lopencv_imgproc: linker input file unused because linking not done i686-apple-darwin10-g++-4.2.1: -lopencv_highgui: linker input file unused because linking not done i686-apple-darwin10-g++-4.2.1: -lopencv_ml: linker input file unused because linking not done i686-apple-darwin10-g++-4.2.1: -lopencv_video: linker input file unused because linking not done i686-apple-darwin10-g++-4.2.1: -lopencv_features2d: linker input file unused because linking not done i686-apple-darwin10-g++-4.2.1: -lopencv_calib3d: linker input file unused because linking not done i686-apple-darwin10-g++-4.2.1: -lopencv_objdetect:

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