message: boost1.68 installed at Travis before the job
diff: @@ -7,6 +7,11 @@ compiler:
  os:
  - linux
  +before_install:
  + - sudo add-apt-repository ppa:mhier/libboost-latest
  + - sudo apt update -q
  + - sudo apt install libboost1.68 libboost1.68-dev -y
  +
  addons:
  apt:
  sources:
  @@ -15,8 +20,6 @@ addons:
  - llvm-toolchain-precise-3.8
  packages:
  - g++-7
  - - libboost1.68
  - - libboost1.68-dev
  - libssl-dev
  - clang-3.8
  - build-essential
  