It is probably best to stick to the newer version only, to avoid
bugs.
Sadly, that is not really an option for me (due to outdated targets,
high variety of developer-machines, difficulties with non-standard
installations,...). Hence, I probably will workaround in the
build-system like:
if [ $($BISON --version | head 1 | ...) -lt 3 ]; then
write_header_config "#define yychar yyla.type"
fi
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