[#### Rapid Array
AC_MSG_CHECKING([if RapidArray kernel headers are present])
# placeholder
-RACPPFLAGS="-I/tmp"
+RACPPFLAGS="-I${LINUX}/drivers/xd1/include"
EXTRA_KCFLAGS_save="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="$EXTRA_KCFLAGS $RACPPFLAGS"
LB_LINUX_TRY_COMPILE([