message: cleanup on qcs readme
diff: @@ -29,13 +29,16 @@ make -j12 install
  cd ../..
  ```
  -## Install uuid-dev
  +## Install uuid-dev and gcc 7
  ```bash
  sudo yum install uuid-dev
  +sudo yum install centos-release-scl
  +sudo yum install devtoolset-7
  ```
  ## Build XACC
  ```bash
  +scl enable devtoolset-7 bash
  git clone --recursive https://github.com/eclipse/xacc
  cd xacc && mkdir build && cd build
  cmake .. -DUUID_LIBRARY=/usr/lib64/libuuid.so.1
  