title: How to install ArUco globally in Ubuntu
body: <p>I installed the ArUco library by following this tutorial <a href="http://miloq.blogspot.com.es/2012/12/install-aruco-ubuntu-linux.html" rel="nofollow noreferrer">http://miloq.blogspot.com.es/2012/12/install-aruco-ubuntu-linux.html</a>. But I am not managing generate a simple executable. I am trying to change a code line in the aruco_test.cpp (a code one that already comes when you install the library. It's in aruco/utils folder). I want to change the camera used in the code, so that I can use my external web cam rather than using the laptop webcam. Whenever I try to compile the *.cpp file on the linux terminal in order to generate a executable, I receive the following error message:</p>
  <blockquote>
  <p>g++ aruco_test.cpp -o aruco_test</p>
  <p>aruco_test.cpp:31:19: fatal error: aruco.h: No such file or directory</p>
  <p>compilation terminated.</p>
  </blockquote>
  <p>A friend of mine said that I didn't install the ArUco library globally, that's why my system can't find the aruco.h. I know where is this header. It's in /usr/local/include/aruco, but I don't know how to say to the system to find this header in that folder.</p>
  <p>If the ArUco library had been installed globally, I could compile the *.cpp file by only including &quot;#include aruco.h&quot; in the code.</p>
  <p>A aruco_test.cpp code copy is found here: <a href="https://github.com/elrond79/aruco/blob/master/utils/aruco_test.cpp" rel="nofollow noreferrer">https://github.com/elrond79/aruco/blob/master/utils/aruco_test.cpp</a></p>
  <p>Can somebody, please, help me?</p>