px4-firmware/README.md

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# ECL
**Very lightweight Estimation & Control Library.**
[![DOI](https://zenodo.org/badge/22634/PX4/ecl.svg)](https://zenodo.org/badge/latestdoi/22634/PX4/ecl) [![Build Status](https://travis-ci.org/PX4/ecl.svg?branch=master)](https://travis-ci.org/PX4/ecl)
This library solves the estimation & control problems of a number of robots and drones. It accepts GPS, vision and inertial sensor inputs. It is extremely lightweight and efficient and yet has the rugged field-proven performance.
The library is BSD 3-clause licensed.
## Building EKF Library
### Prerequisites:
* Matrix: A lightweight, BSD-licensed matrix math library: https://github.com/px4/matrix - it is automatically included as submodule.
By following the steps mentioned below you can create a shared library which can be included in projects using `-l` flag of gcc:
```
mkdir Build/
cd Build/
cmake ../EKF
make
```
Alternatively, just run:
```
./build.sh
```