Attempt to build linux+qt5

Author: dcwhite

.travis.yml

@@ -17,6 +17,14 @@ matrix:
       sudo: required
       compiler: clang
       env: PYTHON_VERSION=3.5.6 OSPRAY_BUILD=OFF QT5=OFF
+    - os: linux
+      dist: xenial
+      compiler: clang
+      env: PYTHON_VERSION=3.5.6 OSPRAY_BUILD=OFF QT5=ON
+    - os: linux
+      dist: bionic
+      compiler: clang
+      env: PYTHON_VERSION=3.5.6 OSPRAY_BUILD=OFF QT5=ON
     - os: osx
       osx_image: xcode7.3
       env: PYTHON_VERSION=3.5.6 OSPRAY_BUILD=OFF QT5=OFF
@@ -54,6 +62,9 @@ install:
 - if [[ "$QT5" = "ON"  && "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install mesa-common-dev libgl1-mesa-dev mesa-utils-extra libglapi-mesa ninja-build qt5-qmake qtbase5-dev; fi
 - if [[ "$QT5" = "OFF" && "$TRAVIS_OS_NAME" == "osx" ]]; then travis_wait 30 scripts/getQt4Mac.sh; fi
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install ninja; fi
+# TODO: figure out/test ccache
+#- if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install ccache; export PATH="/usr/local/opt/ccache/libexec:$PATH"; fi
+# Verify qt 5.13, maybe not upgrade
 - if [[ "$QT5" = "ON"  && "$TRAVIS_OS_NAME" == "osx" ]]; then brew install qt || true; fi
 - if [[ "$QT5" = "ON"  && "$TRAVIS_OS_NAME" == "osx" ]]; then brew upgrade qt || true; fi