You need to make the betterr modules available for import, and you need to link to libR.so and libRInside.so.
What works easiest for me is to create a subdirectory named betterr and create a symbolic link in there to all the betterr modules. libR.so should by default be in a standard location, so the linker should be able to find it without a path using the usual gcc syntax -lR. In contrast, libRInside.so will almost certainly not be in a standard location, so you will need to provide the full path. This is what compilation looks like on my Ubuntu 22.04 machine:
ldmd2 -i program.d -L/usr/lib/R/library/RInside/lib/libRInside.so -L-lRIf you’re not sure where to find libRInside.so, you can run this command in the terminal:
R -s -e 'cat(paste0(find.package("RInside"), "/lib/libRInside.so\n"))'You can copy and paste the output into the Makefile. Alternatively, you can run this command inside R:
find.package("RInside")It’s in the /lib subdirectory relative to that directory. On my system, the call to find.package returns
[1] "/usr/lib/R/library/RInside"which translates into the linker directive above.
If you’re wanting to do low-level linear algebra operations for performance reasons (probably not the case), you’ll need to link to Matrix.so. You can find its location by running this command in the terminal:
R -s -e 'cat(paste0(find.package("Matrix"), "/libs/Matrix.so\n"))'