Yes, that seems to be an (as of yet) unreported bison 1.50 and 1.75 bug.
I've now reported it.
/ Henrik Grubbström (Lysator)
Previous text:
2002-10-18 22:04: Subject: Bison woes continued (this time with 1.75)
Just one error left:
( cd /usr/src/tmp/7.2/src &&\ bison -y -d -v language.yacc &&\ sed -e 's/YY_COUNT_TYPE/unsigned int/' <y.tab.c >language.c &&\ mv y.tab.h language.h_src && rm y.tab.c) language.yacc:2848.3-2856.14: invalid value: $3
the hack mentioned in the Grubba's mail doesn't work in this case.
/ Marek Habersack (Grendel)