Fix for Travis Build (take 3)

Author: Dimitri van Heesch

.travis.yml

@@ -1,10 +1,16 @@
 language: cpp
 compiler:
   - gcc
+  - clang
+
 before_install:
+    - sudo apt-add-repository ppa:smspillaz/cmake-2.8.12 -y
     - sudo add-apt-repository ppa:texlive-backports/ppa -y
     - sudo apt-get update -qq
-    - sudo apt-get install -qq  texlive texlive-extra-utils texlive-latex-extra libxml2-utils
+
+install:
+    - sudo apt-get install -qq texlive texlive-extra-utils texlive-latex-extra libxml2-utils
+    - sudo apt-get install -qq cmake cmake-data
 
 script:
     - mkdir build