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<section id="using-proj-in-cmake-projects">
<span id="cmake"></span><h1>Using PROJ in CMake projects<a class="headerlink" href="#using-proj-in-cmake-projects" title="Permalink to this headline">¶</a></h1>
<p>The recommended way to use the PROJ library in a CMake project is to
link to the imported library target <code class="docutils literal notranslate"><span class="pre">PROJ::proj</span></code> provided by
the CMake configuration which comes with the library. Typical usage is:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>find_package(PROJ CONFIG REQUIRED)
target_link_libraries(MyApp PRIVATE PROJ::proj)
</pre></div>
</div>
<p>By adding the imported library target <code class="docutils literal notranslate"><span class="pre">PROJ::proj</span></code> to the
target link libraries, CMake will also pass the include directories to
the compiler.</p>
<p>The CMake command <code class="docutils literal notranslate"><span class="pre">find_package</span></code> will look for the configuration in a
number of places. The lookup can be adjusted for all packages by setting
the cache variable or environment variable <code class="docutils literal notranslate"><span class="pre">CMAKE_PREFIX_PATH</span></code>. In
particular, CMake will consult (and set) the cache variable
<code class="docutils literal notranslate"><span class="pre">PROJ_DIR</span></code>.</p>
<p>The old CMake name for the PROJ project was “PROJ4” and the switch to
the name “PROJ” was made with version 7.0. So if you expect your
package to work with pre-7.0 versions of PROJ, you will need to use</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>find_package(PROJ4)
target_link_libraries(MyApp PRIVATE ${PROJ4_LIBRARIES})
include_directories(${PROJ4_INCLUDE_DIRS})
</pre></div>
</div>
<p>This will also find version 7.0. This use of the PROJ4 name will be
phased out at some point.</p>
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