Passing USB Port argument to included launch file

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Hi Folks,

I have 2 launch files that i will start with executing one launch file.

In the one launch file i integrated the launch-files with <include> :

<?xml version="1.0"?>

<launch>

<include file="$(find curio_base)/launch/arduino_controller.launch port:=/dev/ttyUSB0" >
</include>

<include file="$(find curio_base)/launch/base_controller.launch" >
</include>

</launch>

I get the error:

RLException: while processing /home/masterkey/curio_ws/src/curio/curio_base/launch/arduino_controller.launch 
port:=/dev/ttyUSB0:
Invalid roslaunch XML syntax: [Errno 2] No such file or directory: 
u'/home/masterkey/curio_ws/src/curio/curio_base/launch/arduino_controller.launch port:=/dev/ttyUSB0'
The traceback for the exception was written to the log file

If I enter in the termianl:

roslaunch curio_base arduino_controller.launch port:=/dev/ttyUSB0

it works.

How do I specify the port:=/dev/ttyUSB0 expression correctly in the launch file?