hector_gazebo_plugins build failure

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Hello All,

I'm trying to build the hector_gazebo stack (hector_gazebo version 0.1.1), but I'm getting the following compiler error:

[ rosmake ] Last 40 linesctor_gazebo_plugins: 42.5 sec ] [ hector_gazebo_thermal_camera: 18.2 sec ] [ gazebo_tests: 0.6 sec ]                         [ 3 Active 101/108 Complete ]
{-------------------------------------------------------------------------------
  [ 77%] [ 88%] Building CXX object CMakeFiles/hector_gazebo_ros_gps.dir/src/gazebo_ros_gps.cpp.o
  Building CXX object CMakeFiles/diffdrive_plugin_6w.dir/src/diffdrive_plugin_6w.cpp.o
  make[3]: Entering directory `/opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/build'
  [100%] Building CXX object CMakeFiles/hector_gazebo_ros_imu.dir/src/gazebo_ros_imu.cpp.o
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/gazebo_ros_sonar.cpp: In member function ‘virtual void gazebo::GazeboRosSonar::Load(gazebo::sensors::SensorPtr, sdf::ElementPtr)’:
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/gazebo_ros_sonar.cpp:88:102: warning: ‘double gazebo::math::Angle::GetAsRadian() const’ is deprecated (declared at /opt/ros/ros_ws_sim/simulator_gazebo/gazebo/gazebo/include/gazebo-1.3/gazebo/math/Angle.hh:87) [-Wdeprecated-declarations]
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/gazebo_ros_sonar.cpp:88:189: warning: ‘double gazebo::math::Angle::GetAsRadian() const’ is deprecated (declared at /opt/ros/ros_ws_sim/simulator_gazebo/gazebo/gazebo/include/gazebo-1.3/gazebo/math/Angle.hh:87) [-Wdeprecated-declarations]
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/gazebo_ros_imu.cpp: In member function ‘virtual void gazebo::GazeboRosIMU::Update()’:
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/gazebo_ros_imu.cpp:290:91: warning: ‘double gazebo::math::Vector3::GetDotProd(const gazebo::math::Vector3&) const’ is deprecated (declared at /opt/ros/ros_ws_sim/simulator_gazebo/gazebo/gazebo/include/gazebo-1.3/gazebo/math/Vector3.hh:126) [-Wdeprecated-declarations]
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/gazebo_ros_imu.cpp:291:85: warning: ‘gazebo::math::Vector3 gazebo::math::Vector3::GetCrossProd(const gazebo::math::Vector3&) const’ is deprecated (declared at /opt/ros/ros_ws_sim/simulator_gazebo/gazebo/gazebo/include/gazebo-1.3/gazebo/math/Vector3.hh:120) [-Wdeprecated-declarations]
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/diffdrive_plugin_6w.cpp: In member function ‘void gazebo::DiffDrivePlugin6W::publish_odometry()’:
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/diffdrive_plugin_6w.cpp:308:3: error: ‘btQuaternion’ was not declared in this scope
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/diffdrive_plugin_6w.cpp:308:16: error: expected ‘;’ before ‘qt’
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/diffdrive_plugin_6w.cpp:309:3: error: ‘btVector3’ was not declared in this scope
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/diffdrive_plugin_6w.cpp:309:13: error: expected ‘;’ before ‘vt’
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/diffdrive_plugin_6w.cpp:310:40: error: ‘qt’ was not declared in this scope
  /opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/src/diffdrive_plugin_6w.cpp:310:44: error: ‘vt’ was not declared in this scope
  Linking CXX shared library ../lib/libreset_plugin.so
  make[3]: Leaving directory `/opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/build'
  [100%] Built target reset_plugin
  make[3]: *** [CMakeFiles/diffdrive_plugin_6w.dir/src/diffdrive_plugin_6w.cpp.o] Error 1
  make[3]: Leaving directory `/opt/ros/ros_ws_sim/hector_gazebo/hector_gazebo_plugins/build'
  make[2]: *** [CMakeFiles/diffdrive_plugin_6w.dir/all] Error 2
  make[2]: *** Waiting for unfinished jobs....

Has anyone encountered this error when building from source? Any guidance would be greatly appreciated since I'm fairly new to ROS and ROS simulations. Thanks in advance!