[ros-users] serial_port package failing to compile

Hi,

I'm having a problem building a package that has serial_port as a
dependency. When I run 'rosmake', I get the following message in the
terminal:

[rosbuild] Building package serial_port
[rosbuild] Including /opt/ros/cturtle/ros/core/rospy/cmake/rospy.cmake
[rosbuild] Including /opt/ros/cturtle/ros/core/roscpp/cmake/roscpp.cmake
[rosbuild] Including /opt/ros/cturtle/ros/core/roslisp/cmake/roslisp.cmake
-- Configuring done
CMake Error: Unable to open cache file for save.
/opt/ros/cturtle/stacks/serial_port/build/CMakeCache.txt
CMake Error: : System Error: Permission denied

I've made sure that all users/groups/etc have read/write access to the
CMakeCache.txt file, but it still doesn't seem to work.

I'm using cturtle with the serial_port package, output from 'uname
-a': Linux robot-brain 2.6.32-25-generic #44-Ubuntu SMP Fri Sep 17 20:26:08
UTC 2010 i686 GNU/Linux

Any help is greatly appreciated.