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→Setup Multiarch
deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports/ xenial main restricted</pre>
Note: armel is not provided in ubuntu 16.04 if you needed we suggested use debian stretch.
==Install apps, libraries or dev packages==
To install a package of the non-default architecture just specify that architecture on the command line: <span id="line-100" class="anchor"></span><span id="line-101" class="anchor"></span><span id="line-102" class="anchor"></span>
<pre><span id="line-1-8" class="anchor"></span>apt-get install package:architecture</pre>
That package's dependencies will be installed automatically for the correct architectures (same-arch library deps, machine-arch for other deps) <span id="line-104" class="anchor"></span>e.g <span id="line-105" class="anchor"></span><span id="line-106" class="anchor"></span><span id="line-107" class="anchor"></span>
<pre><span id="line-1-9" class="anchor"></span>apt-get install links:armhf</pre>
<pre><span id="line-1-10" class="anchor"></span>dpkg -i package_version_architecture.deb
<span id="line-2-1" class="anchor"></span>dpkg -r package:architecture</pre>
===Installing cross-dependencies===
To install build-dependencies of a package before cross-building: <span id="line-118" class="anchor"></span><span id="line-119" class="anchor"></span><span id="line-120" class="anchor"></span>
<pre><span id="line-1-11" class="anchor"></span>apt-get build-dep -a <arch> <package></pre>
This only works when all the 'tools' packages depended-on are marked <tt>Multi-Arch: foreign</tt>, any depended-on libraries which are also needed on the BUILD machine, and -dev packages which are needed for both HOST and BUILD architectures are made co-installable ('Multi-Arch: same' with arch-qualified paths), and any exceptions to the default rules are marked <tt>package:any</tt> or <tt>package:native</tt> in the package source. This process is ongoing. <span id="line-123" class="anchor"></span><span id="line-124" class="anchor"></span>
When it doesn't work you can often get the dependencies installed with a manual apt-get line: <span id="line-125" class="anchor"></span>e.g instead of <span id="line-126" class="anchor"></span><span id="line-127" class="anchor"></span>
<pre><span id="line-1-12" class="anchor"></span>apt-get build-dep -a armhf acl</pre>
, do<span id="line-128" class="anchor"></span><span id="line-129" class="anchor"></span><span id="line-130" class="anchor"></span>
<pre><span id="line-1-13" class="anchor"></span>apt-get install autoconf automake debhelper gettext libtool libattr1-dev:armhf</pre>
[[Toolchain]]
