Round 2

.travis.yml

@@ -11,6 +11,7 @@ script:
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get install libgtk-3-dev -y || sudo apt-cache search libgtk3; fi
   - mkdir build
   - cd build
+  - cmake --version
   - cmake .. -G "Unix Makefiles"
   - make tester examples
   - rm -rf *

CMakeLists.txt

@@ -1,6 +1,6 @@
 # 3 june 2016
 # see https://cmake.org/gitweb?p=cmake.git;a=commit;h=95cdf132489c79e88a10fdf7a7566fa002c7680b (thanks ngladitz in irc.freenode.net/#cmake)
-cmake_minimum_required(VERSION 3.1.0)
+cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
 
 # TODOs
 # - silence entering/leaving messages?