AC_CHECK_LIB([$usb_lib_name], [$usb_lib_func], [], [
libusbok=no
AC_MSG_RESULT([USRP requires library '$usb_lib_name' with function '$usb_lib_func', which was either not found or was not usable. See http://www.libusb.org])
])
AC_CHECK_LIB([$usb_lib_name], [$usb_lib_func], [], [
libusbok=no
AC_MSG_RESULT([USRP requires library '$usb_lib_name' with function '$usb_lib_func', which was either not found or was not usable. See http://www.libusb.org])
])