I seem to be getting this:
gmake[3]: Entering directory `/home/chriskl/pgsql-temp/src/backend/parser'
bison -y -d gram.y
gram.y:4260.4-4307.10: type clash (`boolean' `keyword') on default action
gram.y:4307.11: parse error, unexpected ":", expecting ";" or "|"
gmake[3]: *** [parse.h] Error 1
Chris