Added ros_environment dependency to make sure ROS_VERSION is initialized (#420)

Author: paulbovbel

package.xml

@@ -13,6 +13,8 @@
   <author>Michele Colledanchise</author>
   <author>Davide Faconti</author>
 
+  <build_depend>ros_environment</build_depend>
+
   <buildtool_depend condition="$ROS_VERSION == 1">catkin</buildtool_depend>
   <depend condition="$ROS_VERSION == 1">roslib</depend>
 
@@ -23,7 +25,7 @@
   <depend>boost</depend>
   <depend>libzmq3-dev</depend>
   <depend>libncurses-dev</depend>
-  
+
   <test_depend condition="$ROS_VERSION == 2">ament_cmake_gtest</test_depend>
 
   <export>