[Travis] Install python and VTK packages.

.travis.yml

@@ -13,7 +13,7 @@ before_install:
   - sudo add-apt-repository ppa:kalakris/cmake -y
   - sudo apt-get update -qq
   - sudo apt-get install -y cmake chrpath
-  - sudo apt-get install -y libqt4-dev qt4-dev-tools
+  - sudo apt-get install -y libqt4-dev qt4-dev-tools python-dev libvtk5-dev
   - sudo apt-get install -y xpra xserver-xorg-video-dummy
 
 before_script: xpra --xvfb="Xorg +extension GLX -config `pwd`/Applications/Testing/dummy.xorg.conf -logfile ${HOME}/.xpra/xorg.log"  start :9

CMake/ctkTravisDashboardScript.cmake

@@ -63,6 +63,8 @@ set(ADDITIONNAL_CMAKECACHE_OPTION "
 CTK_BUILD_ALL:BOOL=ON
 CTK_BUILD_EXAMPLES:BOOL=ON
 
+CTK_USE_SYSTEM_VTK:BOOL=ON
+
 #CTK_USE_SYSTEM_DCMTK:BOOL=ON
 #CTK_USE_SYSTEM_ITK:BOOL=ON
 #ITK_DIR:PATH=/usr/lib/InsightToolkit