I had exactly the same problem after transferring to macOS High Sierra (though, errors were not the same, but similar). I found a workaround by renaming /usr/local/include to /usr/local/include_old (well, name does not really matter, just the fact that g++/clang will not search for headers in this folder anymore).
Here’s the solution: sudo npm install –save-dev –unsafe-perm node-sass Enjoy! Edited to explain the options (from comments): –save-dev is used so that your app is able to find the module in local node_modules. –save-dev adds package to devDependencies in package.json. –unsafe–perm is used to run install scripts as root. To avoid sudo, use nvm instead. … Read more
Found the fix for the problem here. xcode-select –install This will bring up a prompt to install the necessary command line tools.
I had the same problem and went through the same steps as you. The final step to allow starting RStudio through Finder/Spotlight was to link libjvm.dylib to /usr/local/lib: sudo ln -f -s $(/usr/libexec/java_home)/jre/lib/server/libjvm.dylib /usr/local/lib -f flag is added to force overwriting existing file/link