Problem can't find -lgfortran

Just make sure you:

gcc --version

And

gfortan --version

Is the same.

/usr/bin/ 

Contains the different versions.

Eg: If gcc--version returns 4.7.3 and gfortran --version 4.8, a simple hack could be to do the following.

sudo cp /usr/bin/gcc-4.8 /usr/bin/gcc