probably need gd-dev for diffimg

diff --git a/.travis.yml b/.travis.yml
index 8eef3be36a6d945bf2af55e912873a93c9bb5ded..938b995469cf04d35356efe6e40e4d9d6a91fbb7 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ addons:
     - libxaw7-dev
     - freeglut3-dev
     - colorgcc
+    - gd-dev
 
 services:
 - docker