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I am running command "make px4_sitl_default gazebo" on Ubuntu18.04(VM) to work with px4 and gazebo, I install all dependencies as shown in http://docs.px4.io/master/en/simulation/gazebo.html however, I am getting the below error every time. I didn't see anybody who takes this kinda failure all forums, so I thought somebody can help me here.

[837/841] Performing build step for 'sitl_gazebo'
ninja: fatal: invalid -j parameter
FAILED: external/Stamp/sitl_gazebo/sitl_gazebo-build 
cd /home/mollaemin/PX4-Autopilot/build/px4_sitl_default/build_gazebo && /usr/bin/cmake --build /home/mollaemin/PX4-Autopilot/build/px4_sitl_default/build_gazebo -- -j 0
ninja: build stopped: subcommand failed.
Makefile:225: recipe for target 'px4_sitl_default' failed
make: *** [px4_sitl_default] Error 1
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1 Answers1

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Looks like it's trying to run with -j 0 which means it is trying to do 0 consecutive jobs at once. Instead, you should manually specify how many you would like to run; i.e. make px4_sitl_default gazebo -j 4

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  • Thanks for answer. I was using VM for Ubuntu. After various problem I decided to install ubuntu my local drive and it works fine now. – Emin Güneş Dec 22 '21 at 00:08