How can I pass flags to R when it is compiling C++ code to be used in a package?

Question

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 u

Answer 1

This is a Makevars file that actually worked for me:

PKG_LIBS = `pkg-config --libs opencv`
PKG_CFLAGS = `pkg-config --cflags opencv`
PKG_CXXFLAGS = `pkg-config --cflags opencv` `Rscript -e 'Rcpp:::CxxFlags()'`
PKG_CFLAGS = `pkg-config --cflags opencv`

Hope this helps.