rosmake error

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hi

i am getting error below when i am trying to rosmake rviz

[rosbuild] Building package rviz
[rosbuild] Cached build flags older than manifests; calling rospack to get flags
Failed to invoke /opt/ros/fuerte/bin/rospack cflags-only-I;--deps-only rviz
Package sensor_msgs was not found in the pkg-config search path.
Perhaps you should add the directory containing `sensor_msgs.pc' to the PKG_CONFIG_PATH environment variable
No package 'sensor_msgs' found

CMake Error at /opt/ros/fuerte/share/ros/core/rosbuild/public.cmake:129 (message):

It is complaining that sensor_msgs.pc is not in PKG_CONFIG_PATH However, the sensor_msgs.pc is in the config path when i check it.

:~/fuerte_workspace$ echo $PKG_CONFIG_PATH
/opt/ros/fuerte/lib/pkgconfig:/opt/ros/fuerte/lib/pkgconfig:/opt/ros/fuerte/lib/pkgconfig

:~/fuerte_workspace$ find /opt/ros/fuerte/lib/pkgconfig | grep 
sensor/opt/ros/fuerte/lib/pkgconfig/sensor_msgs.pc

Does anyone encounter this issue before? Thanks