title: event.h: No such file or directory even when libevent-dev is installed
body: <p>I'm trying to compile a library that depends on libevent. The library is part of a bigger project using cmake build system that has a top-level CMakeLists.txt file.</p>
  
  <p>The CMakelists.txt file within the library directory contains</p>
  
  <pre><code>target_include_directories(&lt;library name&gt; PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} ${SOME_DEP_DIR}/include)
  target_link_libraries(&lt;library name&gt; PUBLIC event)
  </code></pre>
  
  <p>libevent seems to be present on the system -</p>
  
  <pre><code>$ ldconfig -p | grep event
      libtevent.so.0 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libtevent.so.0
      libtevent-util.so.0 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libtevent-util.so.0
      libevent_pthreads-2.1.so.6 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libevent_pthreads-2.1.so.6
      libevent_openssl-2.1.so.6 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libevent_openssl-2.1.so.6
      libevent_extra-2.1.so.6 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libevent_extra-2.1.so.6
      libevent_core-2.1.so.6 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libevent_core-2.1.so.6
      libevent-2.1.so.6 (libc6,x86-64) =&gt; /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
  </code></pre>
  
  <p>So is event.h</p>
  
  <pre><code>$ ls -l /usr/include/event.h 
  -rw-r--r-- 1 root root 2744 Feb  5  2018 /usr/include/event.h
  </code></pre>
  
  <p>I also installed libevent-dev -</p>
  
  <pre><code>$ dpkg -l | grep libevent-dev
  ii  libevent-dev                               2.1.8-stable-4build1                         amd64        Asynchronous event notification library (development files)
  </code></pre>
  
  <p>I'm not sure why when I run <code>make library</code>, I get the following error -</p>
  
  <pre><code>fatal error: event.h: No such file or directory
   #include &lt;event.h&gt;
  </code></pre>
  
  <p>Any suggestions would be helpful. Thanks!</p>