GCC search path

[Nathan England]

If I compile xf86-input-joystick-1.5.0 with

./configure --prefix=/usr

it fails with multiple cannot find this or that... but if I compile it with

CPPFLAGS="-I/usr/include/ -I/usr/include/xorg/ -I/usr/include/pixman-1/"
./configure --prefix=/usr

then it works great.

So my question is why isn't gcc finding the necessary .h files unless I tell
it to include the directories within the /usr/include directory?
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