message: non-superbuild fails on Ubuntu 16 because of older tinyxml2 version. Let's not support that for now.
diff: @@ -9,19 +9,6 @@ matrix:
  compiler: gcc
  env:
  - MATRIX_EVAL="BUILD_TARGET=coverage_build && SUPERBUILD=ON"
  - - os: linux
  - name: "ubuntu 16.04 (non-superbuild)"
  - dist: xenial
  - sudo: false
  - compiler: gcc
  - env:
  - - MATRIX_EVAL="BUILD_TARGET=gcc_build && SUPERBUILD=OFF"
  - addons:
  - apt:
  - packages:
  - - libjsoncpp-dev
  - - libcurl4-openssl-dev
  - - libtinyxml2-dev
  - os: linux
  name: "ubuntu 18.04 (superbuild)"
  dist: bionic
  