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And building with bison on FreeBSD-6.1 produces this:
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...
asing -Wshadow -Os -march=nocona -c `test -f 'warning.c' ||
echo './'`warning.c
source='gbuf.c' object='gbuf.o' libtool=no \
depfile='.deps/gbuf.Po' tmpdepfile='.deps/gbuf.TPo' \
depmode=gcc3 /bin/sh ../depcomp \
cc -DHAVE_CONFIG_H -I. -I. -I.. -I../runtime -Wall -W
-Werror -fno-strict-aliasing -Wshadow -Os -march=nocona -c
`test -f 'gbuf.c' || echo './'`gbuf.c
source='ANSI-C.c' object='ANSI-C.o' libtool=no \
depfile='.deps/ANSI-C.Po' tmpdepfile='.deps/ANSI-C.TPo' \
depmode=gcc3 /bin/sh ../depcomp \
cc -DHAVE_CONFIG_H -I. -I. -I.. -I../runtime -Wall -W
-Werror -fno-strict-aliasing -Wshadow -Os -march=nocona -c
`test -f 'ANSI-C.c' || echo './'`ANSI-C.c
ANSI-C.y: In function `yyparse':
ANSI-C.y:1506: error: syntax error before '}' token
gmake[3]: *** [ANSI-C.o] Error 1
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