How to "fetch v8" on Android phone? I have installed Termux on my phone(Android 7), then I installed git then git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git, then export PATH=$PATH:/data/data/com.termux/files/home/depot_tools But when I try fetch v8 it says:

bash: /data/data/com.termux/files/home/depot_tools/fetch: /usr/bin/env: bad interpreter: No such file or directory
There is no such thing as /usr/bin on Android. Those scripts are obviously intended to run on Linux/Unix systems – but Android uses a different directory structure (e.g. env can be found in /system/bin/env).

You could try adjusting those scripts – but it seems quite likely this will not be the only thing failing, so be prepared for having to adjust a lot …