Travis test
diff --git a/.travis.yml b/.travis.yml
index bdfecea..1d65d5b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,7 @@
     - sudo apt-get install ant
     - sudo apt-get install tclsh
     - sudo apt install default-jre
+    - sudo apt-get install swig
     - eval "${MATRIX_EVAL}"