In trying to do "gmake dvi" in the build directory, the gfortran.texi eventually dies with
I noticed something similar, though the error messages I get are quite different. I tried taking a look. There is a gfortran.log file that lists the errors. I had to type ^Z while texi2dvi was running so I could look at the /tmp/.../gfortran.texi file. All of the errors are for the @gcctabopt macro which has disappeared. This gets included via the doc/include/gcc-common.texi file.
I have texinfo v4.6 installed. If I build texinfo v4.8 it works. The docs say we only need texinfo v4.2 or greater. Perhaps the docs need updating here. I haven't tried other texinfo versions.
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Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com