Warning while compiling fortran

Hello all, I have just installed gfortran following these instructions. It seems to work propertly, but when I try to compile, I get this message:

ld: warning, duplicate dylib /usr/local/lib/libgcc_s.1.dylib

Anyway, the executable file is created. Should I worry about this?

I use gfortran binaries from

I use gfortran binaries from gcc website. I used to get this warning before, but since I recently upgraded to latest binary, the message no longer appears. I think it is harmless.