FIX: Trying to fix CI

.gitlab-ci.yml

 before_script:
-    - echo "deb http://ftp.us.debian.org/debian unstable main contrib non-free" >> /etc/apt/sources.list.d/unstable.list
     - apt-get update
-    - apt-get install -y -qq make cmake libboost-test-dev gem
-    - apt-get install g++-5
+    - apt-get install -y -qq make cmake libboost-test-dev gem g++-7
     - gem install funit
     - ./build.sh