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The gfortran_string_index undefined references indicate that you are somehow using an older libgfortran.so in your build process. First, make sure that you do have a new gfortran runtime libary, that the date on libgfortran.so.3 matches the date on your gcc and gfortran, and the the libgfortran.so symbolic links are pointing to the new libgfortran.so.3.
Then look carefully at PATH, LIBRARY_PATH, and LD_LIBRARY_PATH to make sure they point at the correct GCC/GFortran 4.6.1 installation. If you have a dynamically linked program, you can use ldd to find out where it is getting libgfortran, this may help you diagnose the problem.
Thanks I lot. I could solve the issue