It looks like GCC 4.9.3 won't build with GCC 6.2 (probably due to an increase in compiler strictness or something). The reason Sage is building its own copy of GCC that is you need to have the same versions for gcc, gfortran, and g++. Partial builds with different compilers seems like trouble to me, so running "make distclean && make" after installing gfortan 6.2 seems like the correct thing to do.
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