Where to get the kernel build script nvbuild.sh from? 34.1.1 DP

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
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So I have followed the steps in the Developer Guide for Kernel Customization to sync the kernel sources to Linux_for_Tegra/sources and downloaded the bootlin toolchain from https://developer.nvidia.com/embedded/jetson-linux/bootlin-toolchain-gcc-93 and extracted it.

The guide says I should run $ ./nvbuild.sh -o $PWD/kernel_out to build the kernel.
Depending if I followed the sync or the manual path I should be directly in the Linux_for_Tegra or the Linux_for_Tegra/source/public directory, while the latter does not exist for me because I used the sync way.

The script does not exist. From where do I get it? It does not exist on my system.

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Sorry that source sync will not download it. Need to copy it from the src tarball.

Also, there are several errors in the code from source_sync.sh. It will be fixed in next release. If you want a stable one, please use the src from tarball instead.

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