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The libyang library can be installed from third-party packages available `here
<https://ci1.netdef.org/browse/LIBYANG-YANGRELEASE/latestSuccessful/artifact>`_.
Note: the libyang dev/devel packages need to be installed in addition
to the libyang core package in order to build FRR successfully.
.. warning::
libyang ABI version 0.16.74 or newer will be required to build FRR in the
near future since it significantly eases build and installation
considerations. "0.16-r3" is equal to 0.16.105 and will work, "0.16-r2"
is equal to 0.16.52 and will stop working. The CI artifacts will be
updated shortly.
For example, for CentOS 7.x:
.. code-block:: shell
wget https://ci1.netdef.org/artifact/LIBYANG-YANGRELEASE/shared/build-1/CentOS-7-x86_64-Packages/libyang-0.16.46-0.x86_64.rpm
wget https://ci1.netdef.org/artifact/LIBYANG-YANGRELEASE/shared/build-1/CentOS-7-x86_64-Packages/libyang-devel-0.16.46-0.x86_64.rpm
sudo rpm -i libyang-0.16.46-0.x86_64.rpm libyang-devel-0.16.46-0.x86_64.rpm
or Ubuntu 18.04:
.. code-block:: shell
wget https://ci1.netdef.org/artifact/LIBYANG-YANGRELEASE/shared/build-1/Ubuntu-18.04-x86_64-Packages/libyang-dev_0.16.46_amd64.deb
wget https://ci1.netdef.org/artifact/LIBYANG-YANGRELEASE/shared/build-1/Ubuntu-18.04-x86_64-Packages/libyang_0.16.46_amd64.deb
sudo apt install libpcre3-dev
sudo dpkg -i libyang-dev_0.16.46_amd64.deb libyang_0.16.46_amd64.deb
.. note::
For Debian-based systems, the official libyang package requires recent
versions of swig (3.0.12) and debhelper (11) which are only available in
Debian buster (10). However, libyang packages built on Debian buster can
be installed on both Debian jessie (8) and Debian stretch (9), as well as
various Ubuntu systems. The python3-yang package will not work, but the
other packages (libyang-dev is the one needed for FRR) will.
Alternatively, libyang can be built and installed manually by following
the steps below:
.. code-block:: shell
git clone https://github.com/opensourcerouting/libyang
cd libyang
git checkout -b tmp origin/tmp
mkdir build; cd build
cmake -DENABLE_LYD_PRIV=ON ..
make
sudo make install
When building libyang on CentOS 6, it's also necessary to pass the
``-DENABLE_CACHE=OFF`` parameter to cmake.
Note: please check the `libyang build requirements
<https://github.com/CESNET/libyang/blob/master/README.md#build-requirements>`_
first.
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