message: fix build bug running on MacOS
diff: @@ -61,8 +61,8 @@ EOS.IO currently supports the following operating systems:
  2. [Clean install Centos 7 and higher](#manualdepcentos)
  3. [Clean install Fedora 25 and higher](#manualdepfedora)
  4. [Clean install Mint 18](#manualdepubuntu)
  - 4. [Clean install Ubuntu 16](#manualdepubuntu)
  - 5. [Clean install MacOS Sierra 10.12 and higher](#manualdepmacos)
  + 5. [Clean install Ubuntu 16](#manualdepubuntu)
  + 6. [Clean install MacOS Sierra 10.12 and higher](#manualdepmacos)
  <a name="gettingstarted"></a>
  ## Getting Started
  @@ -147,7 +147,8 @@ cd eos
  For ease of contract development, one further step is required:
  ```bash
  -make install
  +cd build
  +sudo make install
  ```
  Now you can proceed to the next step - [Creating and launching a single-node testnet](#singlenode)
  @@ -172,7 +173,8 @@ git checkout DAWN-2018-02-14 --recurse-submodules
  For ease of contract development, one further step is required:
  ```bash
  -make install
  +cd build
  +sudo make install
  ```
  Now you can proceed to the next step - [Running a node on the public testnet](#publictestnet)
  