CCID installation El Capitan
You may need to tell the configure of ccid where libusb can be found. Install libusb by downloading it and then running

./configure
make
sudo make


Then do the following for ccid:

.configure LIBUSB_CFLAGS=-I/usr/local/include/libusb-1.0 LIBUSB_LIBS="-L/usr/local/lib -lusb-1.0"


(check the version number first).