Install Xcode
Open up AppStore app, login with your Apple credentials, search for xcode and install
$ sudo mkdir -p /Developer/SDKs
$ sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk /Developer/SDKs/MacOSX.sdk


Install brew and a few more packages:
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
$ brew install libiconv (mine was https://homebrew.bintray.com/bottles/libiconv-1.15.high_sierra.bottle.tar.gz)
$ pip install ida-settings idalink


Confirm that LLVM and command line tools have been installed:
$ gcc --version
$ xcode-select --install


Confirm that SDK has been installed
$ xcrun --sdk macosx --show-sdk-path


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