[gnome-commander/GSettings] Adds flex to the list of packages in Dockerfile

[Uwe Scholz <uwescholz src gnome org>]

commit 2fd21a43a2eb51eb414b7def976c64992adf84d9
Author: Uwe Scholz <uwescholz src gnome org>
Date:   Sun Mar 13 14:30:30 2016 +0100

    Adds flex to the list of packages in Dockerfile

 Dockerfile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Dockerfile b/Dockerfile
index c33674c..33cf5c8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ RUN \
   echo $LANG && \
   echo $LC_ALL && \
   sudo apt-get build-dep gnome-commander -y && \
-  sudo apt-get install -y -qq autoconf-archive cmake git-core gnome-common libglib2.0-dev libgtest-dev 
libunique-dev scrollkeeper
+  sudo apt-get install -y -qq autoconf-archive cmake flex git-core gnome-common libglib2.0-dev libgtest-dev 
libunique-dev scrollkeeper
 
 RUN \
   cd /usr/src/gtest && \