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# Building on Windows Systems
Linux is the main development environment recommended ("Windows Subsystem for
Linux" can be used for a full Linux Bash environment under Windows), especially
with regards to building the TensorFlow Lite for Microcontrollers (TFLu)
library, which depends on GNU Make and are using a number of Bash shell scripts.
However, there are a number of possibilities for building on a Windows system.
## Requirements
- **CMake**. E.g. Windows native CMake, MSYS CMake, Cygwin CMake, or MinGW
CMake. (Note: Supported generators may differ).
- **make tool**. E.g. GNU Make, NMAKE, Jom, mingw32-make, GNU Make under MSYS or
Cygwin.
- **ARM toolchain**.
[Arm Clang](https://developer.arm.com/tools-and-software/embedded/arm-compiler)
or
[GNU Arm Embedded Toolchain](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm)
### Building with TensorFlow Lite for Microcontrollers
- **Shell**. E.g. "MSYS shell", "GIT Bash", or "Cygwin Terminal"
- **GNU Make**. (NOTE: required when building TFLu even if another generator is
used in CMake).
- **GNU Wget**.
### Using a prebuilt TensorFlow Lite for Microcontrollers library
A prebuilt TFLu library can be supplied via the variable
`TFLU_PREBUILT_LIBRARY_PATH`. The project can then be built without the
requirements under
[Building with TensorFlow Lite for Microcontrollers](#Building-with-TensorFlow-Lite-for-Microcontrollers)
(apart from the initially build of the library).
## Troubleshooting
There are many options for tools and environment to build in, and the behaviour
in each specific development environment might differ slightly.
* Cross drive locations might not work. If this is the case mount to a usable
path in the shell used.
* There might be issues with NSYS/CMake and some toolchain paths, i.e. 'Program
Files (x86)'. Can be solved by mounting in MSYS to a usable path, or the
native Windows CMake can be called from the MSYS shell.
* GNU Wget is needed for downloads in TFLu.
* There might be issues rebuilding with CMake 3.20, with erroneous dependency
make files generated. Update to CMake 3.20.1, or downgrade to an earlier CMake
version.
* May need to unset TMPDIR environmental variable to get FlatBuffers download in
TFLu to work.
* When using Cygwin Terminal there might be error messages concerning '\r' in
the TFLu Bash scripts. In this case run dos2unix on these scripts.
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