Error attempting to build gazebo on Ubuntu 20.10

I d/l-ed PX4-Autopilot from Github and,according to at https://dev.px4.io/master/en/simulation/gazebo.html I tried to build it. I get this error:

jon@jon-ThinkCentre-M92P:~/PX4/PX4-Autopilot$ make px4_sitl gazebo
[0/5] Performing configure step for ‘sitl_gazebo’
– install-prefix: /usr/local
– cmake build type: RelWithDebInfo
– Using C++17 standard
CMake Error at CMakeLists.txt:47 (find_package):
By not providing “Findgazebo.cmake” in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by “gazebo”, but
CMake did not find one.

Could not find a package configuration file provided by “gazebo” with any
of the following names:

gazeboConfig.cmake
gazebo-config.cmake

Add the installation prefix of “gazebo” to CMAKE_PREFIX_PATH or set
“gazebo_DIR” to a directory containing one of the above files. If “gazebo”
provides a separate development package or SDK, be sure it has been
installed.

– Configuring incomplete, errors occurred!
See also “/home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/build_gazebo/CMakeFiles/CMakeOutput.log”.
See also “/home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/build_gazebo/CMakeFiles/CMakeError.log”.
FAILED: external/Stamp/sitl_gazebo/sitl_gazebo-configure
cd /home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/build_gazebo && /usr/bin/cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DSEND_ODOMETRY_DATA=ON -GNinja /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo && /usr/bin/cmake -E touch /home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/external/Stamp/sitl_gazebo/sitl_gazebo-configure
ninja: build stopped: subcommand failed.
make: *** [Makefile:226: px4_sitl] Error 1
jon@jon-ThinkCentre-M92P:~/PX4/PX4-Autopilot$

To simplify things, I went and d/l-ed just gazebo and, according to https://github.com/PX4/PX4-SITL_gazebo, placed in its own area. Still get the same error:

jon@jon-ThinkCentre-M92P:~$ cd ~/src/sitl_gazebo/build/
jon@jon-ThinkCentre-M92P:~/src/sitl_gazebo/build$ cmake …
– install-prefix: /usr
– cmake build type: RelWithDebInfo
– Using C++17 standard
CMake Error at CMakeLists.txt:47 (find_package):
By not providing “Findgazebo.cmake” in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by “gazebo”, but
CMake did not find one.

Could not find a package configuration file provided by “gazebo” with any
of the following names:

gazeboConfig.cmake
gazebo-config.cmake

Add the installation prefix of “gazebo” to CMAKE_PREFIX_PATH or set
“gazebo_DIR” to a directory containing one of the above files. If “gazebo”
provides a separate development package or SDK, be sure it has been interfaces media models plugins release-notes.html tools worlds
jon@jon-ThinkCentre-M92P:~/gazebo/gazebo-10.0.0$ cd cmake/

installed.

– Configuring incomplete, errors occurred!
See also “/home/jon/src/sitl_gazebo/CMakeFiles/CMakeOutput.log”.
See also “/home/jon/src/sitl_gazebo/CMakeFiles/CMakeError.log”.
jon@jon-ThinkCentre-M92P:~/src/sitl_gazebo/build$

Any help would be greatly appreciated. I’m new here as well as new to cmake, so apologies if this is obvious.

Thanks!

Update: Installed libgazebo-dev and libopencv-dev

It got further in the build:

jon@jon-ThinkCentre-M92P:~/src/sitl_gazebo/build$ cmake …
– install-prefix: /usr
– cmake build type: RelWithDebInfo
– Using C++17 standard
– Found Boost: /usr/lib/x86_64-linux-gnu/cmake/Boost-1.71.0/BoostConfig.cmake (found suitable version “1.71.0”, minimum required is “1.58”) found components: system thread filesystem
– Found DART: /usr/include (Required is at least version “6.6”) found components: dart
– Found Boost: /usr/lib/x86_64-linux-gnu/cmake/Boost-1.71.0/BoostConfig.cmake (found suitable version “1.71.0”, minimum required is “1.40.0”) found components: thread system filesystem program_options regex iostreams date_time
– Looking for ignition-math6 – found version 6.4.0
– Searching for dependencies of ignition-math6
– Looking for OGRE…
– Found Ogre Ghadamon (1.9.0)
– Looking for OGRE_Paging…
– Found OGRE_Paging: optimized;/usr/lib/x86_64-linux-gnu/libOgrePaging.so;debug;/usr/lib/x86_64-linux-gnu/libOgrePaging.so
– Looking for OGRE_Terrain…
– Found OGRE_Terrain: optimized;/usr/lib/x86_64-linux-gnu/libOgreTerrain.so;debug;/usr/lib/x86_64-linux-gnu/libOgreTerrain.so
– Looking for OGRE_Property…
– Found OGRE_Property: optimized;/usr/lib/x86_64-linux-gnu/libOgreProperty.so;debug;/usr/lib/x86_64-linux-gnu/libOgreProperty.so
– Looking for OGRE_RTShaderSystem…
– Found OGRE_RTShaderSystem: optimized;/usr/lib/x86_64-linux-gnu/libOgreRTShaderSystem.so;debug;/usr/lib/x86_64-linux-gnu/libOgreRTShaderSystem.so
– Looking for OGRE_Volume…
– Found OGRE_Volume: optimized;/usr/lib/x86_64-linux-gnu/libOgreVolume.so;debug;/usr/lib/x86_64-linux-gnu/libOgreVolume.so
– Looking for OGRE_Overlay…
– Found OGRE_Overlay: optimized;/usr/lib/x86_64-linux-gnu/libOgreOverlay.so;debug;/usr/lib/x86_64-linux-gnu/libOgreOverlay.so
– Looking for ignition-math6 – found version 6.4.0
– Looking for ignition-transport8 – found version 8.0.0
– Searching for dependencies of ignition-transport8
– Found Protobuf: /usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread (found suitable version “3.12.3”, minimum required is “3”)
– Config-file not installed for ZeroMQ – checking for pkg-config
– Checking for module ‘libzmq >= 4’
– Found libzmq , version 4.3.2
– Checking for module ‘uuid’
– Found uuid, version 2.36.0
– Looking for ignition-msgs5 – found version 5.1.0
– Searching for dependencies of ignition-msgs5
– Looking for ignition-math6 – found version 6.4.0
– Checking for module ‘tinyxml2’
– Found tinyxml2, version 8.0.0
– Looking for ignition-msgs5 – found version 5.1.0
– Looking for ignition-common3 – found version 3.5.0
– Searching for dependencies of ignition-common3
– Looking for dlfcn.h - found
– Looking for libdl - found
– Searching for component [graphics]
– Looking for ignition-common3-graphics – found version 3.5.0
– Searching for dependencies of ignition-common3-graphics
– Looking for ignition-math6 – found version 6.4.0
– Looking for ignition-fuel_tools4 – found version 4.1.0
– Searching for dependencies of ignition-fuel_tools4
– Checking for module ‘jsoncpp’
– Found jsoncpp, version 1.7.4
– Checking for module ‘yaml-0.1’
– Found yaml-0.1, version 0.2.2
– Checking for module ‘libzip’
– Found libzip, version 1.5.1
– Looking for ignition-common3 – found version 3.5.0
– Looking for ignition-msgs5 – found version 5.1.0
– Checking for module ‘gstreamer-1.0 >= 1.0’
– No package ‘gstreamer-1.0’ found
– Checking for module ‘gstreamer-base-1.0 >= 1.0’
– No package ‘gstreamer-base-1.0’ found
– Building klt_feature_tracker without catkin
– Building OpticalFlow with OpenCV
– Could NOT find MAVLink (missing: MAVLINK_INCLUDE_DIRS) (found version “2.0”)
– catkin DISABLED
– Found Protobuf: /usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread (found version “3.12.3”)
– Gazebo version: 11.0
– Found GStreamer: adding gst_camera_plugin
– Found GStreamer: adding gst_video_stream_widget
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
GSTREAMER_LIBRARIES (ADVANCED)
linked by target “gazebo_airship_dynamics_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “sensor_msgs” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_airspeed_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_groundtruth_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “physics_msgs” in directory /home/jon/src/sitl_gazebo
linked by target “std_msgs” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_usv_dynamics_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_video_stream_widget” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_gps_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_opticalflow_mockup_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_irlock_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_geotagged_images_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_parachute_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_lidar_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_multirotor_base_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_wind_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_opticalflow_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_uuv_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “nav_msgs” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_sonar_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_vision_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_gst_camera_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “mav_msgs” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_controller_interface” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_gimbal_controller_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_imu_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_mavlink_interface” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_motor_model” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_magnetometer_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_barometer_plugin” in directory /home/jon/src/sitl_gazebo
linked by target “LiftDragPlugin” in directory /home/jon/src/sitl_gazebo
linked by target “gazebo_catapult_plugin” in directory /home/jon/src/sitl_gazebo
_MAVLINK_INCLUDE_DIR
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests
used as include directory in directory /home/jon/src/sitl_gazebo/unit_tests

– Configuring incomplete, errors occurred!
See also “/home/jon/src/sitl_gazebo/CMakeFiles/CMakeOutput.log”.
See also “/home/jon/src/sitl_gazebo/CMakeFiles/CMakeError.log”.
jon@jon-ThinkCentre-M92P:~/src/sitl_gazebo/build$ cd ~/PX4/PX4-Autopilot
jon@jon-ThinkCentre-M92P:~/PX4/PX4-Autopilot$ make px4_sitl gazebo
[0/5] Performing configure step for ‘sitl_gazebo’
– install-prefix: /usr/local
– cmake build type: RelWithDebInfo
– Using C++17 standard
– Found Boost: /usr/lib/x86_64-linux-gnu/cmake/Boost-1.71.0/BoostConfig.cmake (found suitable version “1.71.0”, minimum required is “1.58”) found components: system thread filesystem
– Found DART: /usr/include (Required is at least version “6.6”) found components: dart
– Found Boost: /usr/lib/x86_64-linux-gnu/cmake/Boost-1.71.0/BoostConfig.cmake (found suitable version “1.71.0”, minimum required is “1.40.0”) found components: thread system filesystem program_options regex iostreams date_time
– Looking for ignition-math6 – found version 6.4.0
– Searching for dependencies of ignition-math6
– Looking for OGRE…
– Found Ogre Ghadamon (1.9.0)
– Looking for OGRE_Paging…
– Found OGRE_Paging: optimized;/usr/lib/x86_64-linux-gnu/libOgrePaging.so;debug;/usr/lib/x86_64-linux-gnu/libOgrePaging.so
– Looking for OGRE_Terrain…
– Found OGRE_Terrain: optimized;/usr/lib/x86_64-linux-gnu/libOgreTerrain.so;debug;/usr/lib/x86_64-linux-gnu/libOgreTerrain.so
– Looking for OGRE_Property…
– Found OGRE_Property: optimized;/usr/lib/x86_64-linux-gnu/libOgreProperty.so;debug;/usr/lib/x86_64-linux-gnu/libOgreProperty.so
– Looking for OGRE_RTShaderSystem…
– Found OGRE_RTShaderSystem: optimized;/usr/lib/x86_64-linux-gnu/libOgreRTShaderSystem.so;debug;/usr/lib/x86_64-linux-gnu/libOgreRTShaderSystem.so
– Looking for OGRE_Volume…
– Found OGRE_Volume: optimized;/usr/lib/x86_64-linux-gnu/libOgreVolume.so;debug;/usr/lib/x86_64-linux-gnu/libOgreVolume.so
– Looking for OGRE_Overlay…
– Found OGRE_Overlay: optimized;/usr/lib/x86_64-linux-gnu/libOgreOverlay.so;debug;/usr/lib/x86_64-linux-gnu/libOgreOverlay.so
– Looking for ignition-math6 – found version 6.4.0
– Looking for ignition-transport8 – found version 8.0.0
– Searching for dependencies of ignition-transport8
– Found Protobuf: /usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread (found suitable version “3.12.3”, minimum required is “3”)
– Config-file not installed for ZeroMQ – checking for pkg-config
– Checking for module ‘libzmq >= 4’
– Found libzmq , version 4.3.2
– Checking for module ‘uuid’
– Found uuid, version 2.36.0
– Looking for ignition-msgs5 – found version 5.1.0
– Searching for dependencies of ignition-msgs5
– Looking for ignition-math6 – found version 6.4.0
– Checking for module ‘tinyxml2’
– Found tinyxml2, version 8.0.0
– Looking for ignition-msgs5 – found version 5.1.0
– Looking for ignition-common3 – found version 3.5.0
– Searching for dependencies of ignition-common3
– Looking for dlfcn.h - found
– Looking for libdl - found
– Searching for component [graphics]
– Looking for ignition-common3-graphics – found version 3.5.0
– Searching for dependencies of ignition-common3-graphics
– Looking for ignition-math6 – found version 6.4.0
– Looking for ignition-fuel_tools4 – found version 4.1.0
– Searching for dependencies of ignition-fuel_tools4
– Checking for module ‘jsoncpp’
– Found jsoncpp, version 1.7.4
– Checking for module ‘yaml-0.1’
– Found yaml-0.1, version 0.2.2
– Checking for module ‘libzip’
– Found libzip, version 1.5.1
– Looking for ignition-common3 – found version 3.5.0
– Looking for ignition-msgs5 – found version 5.1.0
– Checking for module ‘gstreamer-1.0 >= 1.0’
– No package ‘gstreamer-1.0’ found
– Checking for module ‘gstreamer-base-1.0 >= 1.0’
– No package ‘gstreamer-base-1.0’ found
– Building klt_feature_tracker without catkin
– Building OpticalFlow with OpenCV
– catkin DISABLED
– Found Protobuf: /usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread (found version “3.12.3”)
– Gazebo version: 11.0
– Found GStreamer: adding gst_camera_plugin
– Found GStreamer: adding gst_video_stream_widget
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
GSTREAMER_LIBRARIES (ADVANCED)
linked by target “gazebo_airship_dynamics_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “sensor_msgs” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_airspeed_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_groundtruth_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “physics_msgs” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “std_msgs” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_usv_dynamics_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_video_stream_widget” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_gps_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_opticalflow_mockup_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_irlock_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_geotagged_images_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_parachute_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_lidar_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_multirotor_base_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_wind_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_opticalflow_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_uuv_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “nav_msgs” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_sonar_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_vision_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_gst_camera_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “mav_msgs” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_controller_interface” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_gimbal_controller_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_imu_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_mavlink_interface” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_motor_model” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_magnetometer_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_barometer_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “LiftDragPlugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo
linked by target “gazebo_catapult_plugin” in directory /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo

– Configuring incomplete, errors occurred!
See also “/home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/build_gazebo/CMakeFiles/CMakeOutput.log”.
See also “/home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/build_gazebo/CMakeFiles/CMakeError.log”.
FAILED: external/Stamp/sitl_gazebo/sitl_gazebo-configure
cd /home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/build_gazebo && /usr/bin/cmake -DCMAKE_INSTALL_PREFIX=/usr/local -DSEND_ODOMETRY_DATA=ON -GNinja /home/jon/PX4/PX4-Autopilot/Tools/sitl_gazebo && /usr/bin/cmake -E touch /home/jon/PX4/PX4-Autopilot/build/px4_sitl_default/external/Stamp/sitl_gazebo/sitl_gazebo-configure
ninja: build stopped: subcommand failed.
make: *** [Makefile:226: px4_sitl] Error 1
jon@jon-ThinkCentre-M92P:~/PX4/PX4-Autopilot$

The hunt continues…