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(g77-295.info)GNU C Required

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GNU C Required
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   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.