Add perl-opengl to install list.

lordofhyphens · lordofhyphens · commit 84bac674d78e · 2020-06-13T15:09:42.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -51,6 +51,7 @@ addons:
     - libboost1.70
     - libboost1.70-dev
     - liblocal-lib-perl
+    - libopengl-perl
 
 
 ssh_known_hosts: dl.slic3r.org
