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---
# Introduction
The Dart VM runs on a variety of ARM processors on Linux and Android. This document explains how to build the Dart VM and SDK to target these platforms.
# Cross-compiling
If you are building natively on the device you will be running on, you can skip this step. The build scripts download a cross-compilation toolchain using clang that supports ia32, x64, arm and arm64, so you do not need to install a cross-compiler yourself unless you want to target riscv.
## Linux
If you are running Debian/Ubuntu, you can obtain a cross-compiler by doing the following:
```
$ sudo apt-get install g++-arm-linux-gnueabihf # For 32-bit ARM (ARMv7)
$ sudo apt-get install g++-aarch64-linux-gnu # For 64-bit ARM (ARMv8)
$ sudo apt-get install g++-riscv64-linux-gnu # For 64-bit RISC-V (RV64GC)
You can also produce only a Dart VM runtime, no SDK, by replacing `create_sdk` with `runtime`. This process involves also building a VM that targets ia32/x64, which is used to generate a few parts of the SDK.
You can use a different toolchain using the -t switch. For example, if the path to your gcc is /path/to/toolchain/prefix-gcc, then you'd invoke the build script with:
```
$ ./tools/build.py --no-rbe --no-clang -m release -a arm -t arm=/path/to/toolchain/prefix create_sdk