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<section id="development">
<span id="id1"></span><h1>Development<a class="headerlink" href="#development" title="Permalink to this headline">¶</a></h1>
<p>These pages are primarily focused towards developers either contributing to the
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<li class="toctree-l1"><a class="reference internal" href="migration.html#version-4-to-5-api-migration">Version 4 to 5 API Migration</a></li>
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<p>The source code for PROJ is maintained in a
<a class="reference external" href="https://github.com/OSGeo/PROJ">git repository on GitHub</a>.
Additionally, a collection of PROJ-compatible transformation grids
are maintained in a <a class="reference external" href="https://github.com/OSGeo/proj-datumgrid">separate git repository</a>.</p>
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version 6.0.0 on onwards. Use CMake instead.</p>
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<p>The <code class="file docutils literal notranslate"><span class="pre">proj_api.h</span></code> header and the functions related to it is
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<p>With the introduction of PROJ 5, behavioural changes has been made to
existing functionality. Consult <a class="reference internal" href="../usage/differences.html#differences"><span class="std std-ref">Known differences between versions</span></a> for the details.</p>
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