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#### Prerequisites
The following toolchains are needed to build _nncc_ project:
- CMake (>= 3.1)
- g++ (>= 4.8)
#### How to build _nncc_ with docker
_nncc_ provides ``Dockerfile`` in order to make it easy to setup development environment.
One may build ``nncc`` docker image with the following command:
```
nncc$ cat infra/docker/Dockerfile | docker build -t nncc -
...
```
By default, this ``Dockerfile`` uses "archive.ubuntu.com" which may be quite slow. One may use mirror site via ``UBUNTU_MIRROR`` variable.
For example, one may enable the use of ``kr.archive.ubuntu.com`` via the following command
```
nncc$ cat infra/docker/Dockerfile | docker build --build-arg UBUNTU_MIRROR="kr.archive.ubuntu.com" -t nncc -
...
```
One who works behind proxy should provide proxy configuration via the following command:
```
nncc$ cat infra/docker/Dockerfile | docker build --build-arg HTTP_PROXY=<HTTP proxy address> --build-arg HTTPS_PROXY=<HTTPS proxy address> -t nncc -
...
```
One may use simplified command if ``HTTP_PROXY`` and ``HTTPS_PROXY`` environment variables are already set:
```
nncc$ export
...
declare -x HTTP_PROXY=...
declare -x HTTPS_PROXY=...
...
nncc$ cat infra/docker/Dockerfile | docker build --build-arg HTTP_PROXY --build-arg HTTPS_PROXY -t nncc -
...
```
Note that these configurations are orthogonal to each other. One may freely combine these options as follows:
```
nncc$ cat infra/docker/Dockerfile | docker build --build-arg HTTP_PROXY --build-arg HTTPS_PROXY --build-arg UBUNTU_MIRROR="kr.archive.ubuntu.com" -t nncc -
```
One may easily build _nncc_ with the following command once ``nncc`` docker image is built.
```
nncc$ ./nncc docker-nncc configure
...
nncc$ ./nncc docker-nncc build
...
```
#### How to build _nncc_ with ninja
You may build _nncc_ with ninja (instead of make) if ninja is available. Please try the following commands:
```
nncc$ rm -rf build
nncc$ ./nncc configure -G Ninja
nncc$ ./nncc build
```
#### How to build and run _nncc_ unittests
_nncc_ includes various unittests to check its correctness. One may build and run these unittests via the following command:
```
nncc$ rm -rf build
nncc$ ./nncc configure -DENABLE_TEST=1
nncc$ ./nncc build
nncc$ ./nncc test
```
**NOTE** As _nncc_ unittests are implemented on top of google test framework (_gtest_), _nncc_ build script will automatically download _gtest_ 1.8 from public GitHub.
If you are not able to access public GitHub from your machine, please override download URL via ``GTEST_URL`` environment variable.
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