Travis CI configuration improvement

.travis.yml

@@ -2,13 +2,36 @@
 # which are TOO old for us. Wait for 'xenial' support or
 # install Qt >= 5.3 and CMake >= 3.0 from some PPA
 language: cpp
-compiler: gcc
+compiler:
+  - gcc
+  - clang
 dist: xenial
 addons:
-    apt:
-        packages:
-        - python3-all
-        - qt5-default
+  apt:
+    packages:
+      - python3-all
+      - qt5-default
+      - qtscript5-dev
+      - libssl-dev
+      - qttools5-dev
+      - qttools5-dev-tools
+      - qtmultimedia5-dev
+      - libqt5svg5-dev
+      - libqt5webkit5-dev
+      - libsdl2-dev
+      - libasound2
+      - libxmu-dev
+      - libxi-dev
+      - freeglut3-dev
+      - libasound2-dev
+      - libjack-jackd2-dev
+      - libxrandr-dev
+      - libqt5xmlpatterns5-dev
+      - libqt5xmlpatterns5
+      - libqt5xmlpatterns5-private-dev
 script:
-    - cmake -DUSE_QT=5
+    - mkdir build
+    - cd build
+    - cmake -DUSE_QT=5 ..
     - make
+