rospack error(libboost_system_mt-1.48.so)

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Hi, I'm trying to cross-compile Nao V4. But when I use rospack command, following error message comes out.

rospack: error while loading shared libraries: libboost_system-mt-1_48.so.1.48.0: cannot open shared object file: No such file or directory

I tried installing library files by "$ sudo apt-get install libboost-system libboost-dev etc. But nothing has been solved.

In fact, I found out this error when I tried to source $TARGETDIR/workspace_nao/setup.bash, which contained "rospack" command. This content came from http://www.ros.org/wiki/nao/Tutorials/Cross-Compiling_NAO-V4#Creating_a_workspacehttp:// (tutorial). When I tried to source setup.bash, following error message came out.

rospack could not be found, you cannot have rosbash features until you bootstrap ros

So I think that it is the error coming from rospack error related with library(libboost?).

Is there Anyone who knows the solution?

Thanks in advance! :)