ROS Graph Messages Build

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Hi,

I'm ROS1 beginner, and I've been trying to get moveit installed and running. When running catkin_make, cmake fails with:

-- +++ processing catkin package: 'moveit_commander'
-- ==> add_subdirectory(moveit/moveit_commander)
-- +++ processing catkin package: 'rviz_visual_tools'
-- ==> add_subdirectory(rviz_visual_tools)
-- Could NOT find graph_msgs (missing: graph_msgs_DIR)
-- Could not find the required component 'graph_msgs'. The following CMake error indicates that you either need to install 
   the package with the same name or change your environment so that it can be found.
  CMake Error at /opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:83 (find_package):
  Could not find a package configuration file provided by "graph_msgs" with
  any of the following names:

   graph_msgsConfig.cmake

I've tried installing it with rosdep install rosgraph_msgs, which says the installation was successful. However, when I run roswtf, I get the following error:

ERROR: The core ROS message libraries (std_msgs and rosgraph_msgs) have not been built.

I then tried cloning the source for the rosgraph_msgs repo from https://github.com/ros/ros_comm_msgs, but it doesn't provide a rosinstall file or a CMakeLists.txt file.

For further info here is the output of env | grep -i ros:

PATH=/home/ttt/anaconda3/envs/py27/bin:/opt/ros/melodic/bin:/home/ttt/anaconda3/bin:/home/ttt/anaconda3/condabin:/usr/local/bin:/usr/local/sbin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
CMAKE_PREFIX_PATH=/home/ttt/Programming/ROS/rostest2/devel:/opt/ros/melodic
LD_LIBRARY_PATH=/home/ttt/Programming/ROS/rostest2/devel/lib:/opt/ros/melodic/lib
PKG_CONFIG_PATH=/home/ttt/Programming/ROS/rostest2/devel/lib/pkgconfig:/opt/ros/melodic/lib/pkgconfig
PYTHONPATH=/home/ttt/Programming/ROS/rostest2/devel/lib/python3/dist-packages:/opt/ros/melodic/lib/python2.7/dist-packages
ROS_DISTRO=melodic
ROS_ETC_DIR=/opt/ros/melodic/etc/ros
ROS_PACKAGE_PATH=/home/ttt/Programming/ROS/rostest2/src:/opt/ros/melodic/share
ROS_PYTHON_VERSION=2
ROS_VERSION=1
ROS_ROOT=/opt/ros/melodic/share/ros
ROS_MASTER_URI=http://localhost:11311
ROSLISP_PACKAGE_DIRECTORIES=/home/ttt/Programming/ROS/rostest2/devel/share/common-lisp