* trying to fix travis build with ninja

.travis.yml

@@ -33,6 +33,7 @@ before_install:
 install:
 
 script:
+  - cmake --version
   - cd $NPTOOL/NPLib 
   - cmake -GNinja ./
   - ninja-build install 

NPLib/scripts/test/simulation_build.sh

@@ -5,12 +5,18 @@ set -ev
 
 # go to nps
 cd $NPTOOL/NPSimulation
-cmake ./
-if [ -e Makefile ] 
-then
-  make install
-else
+
+# Check if ninja or ninja-build is there, otherwise fall back on make
+if hash ninja-build 2>/dev/null; then
+  cmake -GNinja ./
+  ninja-build install
+elif hash ninja 2>/dev/null; then
+  cmake -GNinja ./
   ninja install
+else
+  cmake ./
+  make install
 fi
+
 # minimal run
 npsimulation -h