Install missing packages on CI

.gitlab-ci.yml

@@ -5,7 +5,7 @@ build:
     DEBIAN_FRONTEND: noninteractive
   before_script:
     - sudo apt-get update
-    - sudo apt-get install -y dvipng python-imaging rubber texlive-fonts-recommended texlive-latex-extra texlive-math-extra
+    - sudo apt-get install -y ant dvipng maven python-imaging rubber texlive-fonts-recommended texlive-latex-extra texlive-math-extra wget
     - wget -O plastex.tar.gz https://github.com/tiarno/plastex/archive/1.0.0.tar.gz
     - tar -xzvf plastex.tar.gz
     - cd plastex-1.0.0 && sudo python setup.py install