error undefined reference to `_gfortran_concat_string’

I have tried to compile a code in Linux Ubuntu 12.04 (same as Linux Mint 13). When I try to compile this code, I get error message like this :

This problem showed because we forget to add other library to our Makefile. We can remove this message with add flag “-lgfortran” in our Makefile command. This is a sample method how to add this flag in our Makefile :

We only need to add “-lgfortran“. This method would remove all undefined reference to `_gfortran_concat_string’ error message.

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