It seems the math library 'libmpfr.so' could not be found by the compiler (angstrom's cross compiler in your case).
It seems that you have not installed your cross compiler properly. Best solution is to install that correctly.

Or, you could manually try to set the LD_LIBRARY_PATH and PATH environment variables to try your luck.

Example:

Qt Code: 
  1. export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:</path/to/your/cross/compiler's/lib/directory>
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set the PATH variable if needed.

You may need to do edit your ~/.bashrc or your shell's profile to include the above to set it permanently.

Good luck.