No such file when I search in finder.
Please read again my post which Ben linked.
So I found the file, but I am not permitted to edit it. I even try your solution here of opening it in Rstudio. It automatically changes to Makevars.makefile, rather than Makevars.
Thank you for your patience…
Ok, so when I fix that Makevars file and run the Rccp file, now I get this error:
clang-7: error: no such file or directory: '/Library/Frameworks/R.framework/Resources/lib/libc++abi.1.dylib'
make: *** [sourceCpp_2.so] Error 1