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 Mac OS X Build Instructions and Notes
 ====================================
 The commands in this guide should be executed in a Terminal application.
 The built-in one is located in `/Applications/Utilities/Terminal.app`.
 
 Preparation
 -----------
 
 1.  Install Xcode from the app store if you don't have it already (it's a dependency for qt5)
 
     NOTE: Building with Qt4 is still supported, however, could result in a broken UI. Building with Qt5 is recommended.
 
 2.  Install the OS X command line tools:
 
 `xcode-select --install`
 
 When the popup appears, click `Install`.
 
 3.  Install [Homebrew](https://brew.sh).
 
 Dependencies
 ----------------------
 
 Install dependencies:
 
-    brew install automake berkeley-db libtool boost miniupnpc openssl pkg-config protobuf python qt libevent
+    brew install automake berkeley-db libtool boost miniupnpc openssl pkg-config protobuf python qt libevent qrencode
 
 See [dependencies.md](dependencies.md) for a complete overview.
 
 If you want to build the disk image with `make deploy` (.dmg / optional), you need RSVG
 
     brew install librsvg
 
 Build Bitcoin ABC
 -----------------
 
 Before you start building, please make sure that your compiler supports C++14.
 
 1. Clone the Bitcoin ABC source code and cd into `bitcoin-abc`
 
         git clone https://github.com/Bitcoin-ABC/bitcoin-abc.git
         cd bitcoin-abc
 
 2.  Build bitcoin-abc:
 
     Configure and build the headless bitcoin binaries as well as the GUI (if Qt is found).
 
     You can disable the GUI build by passing `--without-gui` to configure.
 
     It is recommended to create a build directory to build out-of-tree. 
 
         ./autogen.sh
         mkdir build
         cd build
         ../configure
         make
 
 3.  It is recommended to build and run the unit tests:
 
         make check
 
 4.  You can also create a .dmg that contains the .app bundle (optional):
 
         make deploy
 
 Running
 -------
 
 Bitcoin ABC is now available at `./src/bitcoind`
 
 Before running, it's recommended you create an RPC configuration file.
 
     echo -e "rpcuser=bitcoinrpc\nrpcpassword=$(xxd -l 16 -p /dev/urandom)" > "/Users/${USER}/Library/Application Support/Bitcoin/bitcoin.conf"
 
     chmod 600 "/Users/${USER}/Library/Application Support/Bitcoin/bitcoin.conf"
 
 The first time you run bitcoind, it will start downloading the blockchain. This process could take several hours.
 
 You can monitor the download process by looking at the debug.log file:
 
     tail -f $HOME/Library/Application\ Support/Bitcoin/debug.log
 
 Other commands:
 -------
 
     ./src/bitcoind -daemon # Starts the bitcoin daemon.
     ./src/bitcoin-cli --help # Outputs a list of command-line options.
     ./src/bitcoin-cli help # Outputs a list of RPC commands when the daemon is running.
 
 Notes
 -----
 
 * Building with downloaded Qt binaries is not officially supported. See the notes in [#7714](https://github.com/bitcoin/bitcoin/issues/7714)