Compiling g77 requires GNU C, not just ANSI C.
Fixing this wouldn't
be very hard (just tedious), but the code using GNU extensions to
the C language is expected to be rewritten for 0.6 anyway,
so there are no plans for an interim fix.
This requirement does not mean you must already have gcc
installed to build g77.
As long as you have a working C compiler, you can use a
bootstrap build to automate the process of first building
gcc using the working C compiler you have, then building
g77 and rebuilding gcc using that just-built gcc,
and so on.
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