If `make px4_sitl_default` is run, and not `make px4_sitl_default gazebo` then each model instance will throw the following errors:
```
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_gps_plugin.so: libgazebo_gps_plugin.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_multirotor_base_plugin.so: libgazebo_multirotor_base_plugin.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_motor_model.so: libgazebo_motor_model.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_motor_model.so: libgazebo_motor_model.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_motor_model.so: libgazebo_motor_model.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_motor_model.so: libgazebo_motor_model.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_groundtruth_plugin.so: libgazebo_groundtruth_plugin.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_magnetometer_plugin.so: libgazebo_magnetometer_plugin.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_barometer_plugin.so: libgazebo_barometer_plugin.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_mavlink_interface.so: libgazebo_mavlink_interface.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libgazebo_imu_plugin.so: libgazebo_imu_plugin.so: cannot open shared object file: No such file or directory
```
- sitl_gazebo in PX4/Firmware (f4d7052bece7608fc3f94b6520b788fc83339635): 629e5f5c23
- sitl_gazebo current upstream: ce1eca2bd0
- Changes: 629e5f5c23...ce1eca2bd0
ce1eca2 2020-07-19 Daniel Leonard Robinson - New vehicle type: Airship (#490)
df186d2 2020-07-18 TSC21 - use 'EnableC++XX' and remove duplicated compiler sets
60e5d4e 2020-07-18 TSC21 - remove the check for the 'px4' binary (it's never found since it's built in parallel with sitl_gazebo)
a3b5c5e 2020-07-19 JaeyoungLim - Fix moment calculation (#545)
07820ee 2020-07-19 JaeyoungLim - Fix gimbal imu sensors intefering with each other (#549)
- Spaces -> tabs.
- Remove "brew install python" because it's already a dependency of the
px4-dev tap.
- Remove "brew install ccache" as we can also add it to the px4-dev tap.
- Don't try to update pip installation, it works fine as is.
- Install pip dependencies as user, no need for system-wide install.
- sitl_gazebo in PX4/Firmware (38588f0c37f4512ab4c5f32d2ce4efc838dede46): 309f7b0ace
- sitl_gazebo current upstream: 1af7e29dbb
- Changes: 309f7b0ace...1af7e29dbb
1af7e29 2020-06-25 JaeyoungLim - Do not validate r1_rover
5e8ddfb 2020-06-25 Benjamin Perseghetti - fixes for R1 SDF https://github.com/PX4/sitl_gazebo/issues/533 (#534)
726c066 2020-06-23 Supakorn Suttiruang - Remove the incorrect force generated by moment (#532)
Co-authored-by: PX4 BuildBot <bot@px4.io>
- sitl_gazebo in PX4/Firmware (6b343c1f5ecd1b410b931d8f49b75cace82bbe98): 97106007eb
- sitl_gazebo current upstream: 846190e8a3
- Changes: 97106007eb...846190e8a3
846190e 2020-06-18 Daniel Agar - cmake set build type and C/C++ standard
1cd16d7 2020-06-18 JaeyoungLim - Set GPS utc time to use utc time (#522)
- remove all remaining IOCTLs for accel and gyro and handle all calibration entirely in sensors module with parameters
- sensor_accel and sensor_gyro are now always raw sensor data
- calibration procedures no longer need to first clear existing values before starting
- temperature calibration (TC) remove all scale (SCL) parameters
- gyro and baro scale are completely unused
- regular accel calibration scale can be used (CAL_ACC*_xSCALE) instead of TC scale
- sitl_gazebo in PX4/Firmware (39a33a35ae0f02a58b45e33de5cc8cb844b52755): 20e8dbe115
- sitl_gazebo current upstream: 3ba325b00f
- Changes: 20e8dbe115...3ba325b00f
3ba325b 2020-06-03 Julian Oes - geotagged_images: actually report number of images
92453d1 2020-05-21 JaeyoungLim - Cleanup
9aef888 2020-05-21 JaeyoungLim - Translate yaw to point at the right direction
