#AC_CHECK_HEADERS(usb.h, [have_libusb="yes"], [ AC_MSG_WARN([usb.h not found, use --enable-libusb=PATH. Otherwise, INDI will compile without Apogee USB support.]) ])
AC_CHECK_LIB(usb, usb_close,,)
AM_CONDITIONAL(HAVE_LIBUSB, test "x$have_libusb" = "xyes")