If I compile xf86-input-joystick-1.5.0 with 
<div><br></div><div>./configure --prefix=/usr </div><div><br></div><div>it fails with multiple cannot find this or that... but if I compile it with</div><div><br></div><div>CPPFLAGS=&quot;-I/usr/include/ -I/usr/include/xorg/ -I/usr/include/pixman-1/&quot; ./configure --prefix=/usr</div>
<div><br></div><div>then it works great.</div><div><br></div><div>So my question is why isn&#39;t gcc finding the necessary .h files unless I tell it to include the directories within the /usr/include directory?</div>