Compilation errors

Does anyone happen to know what it is about my build environment that causes
these errors? I get a similar slew of errors from each flex lexer we built
including the plpgsql lexer, the ecpg lexer, etc. Do I have the wrong version
of flex installed? Something else? It's quite annoying, especially as the beta
version of Emacs I'm using seems to not be able to parse these lines.

In file included from gram.y:9493:
scan.c:7050: warning: no previous prototype for 'base_yyget_lineno'
scan.c:7059: warning: no previous prototype for 'base_yyget_in'
scan.c:7067: warning: no previous prototype for 'base_yyget_out'
scan.c:7075: warning: no previous prototype for 'base_yyget_leng'
scan.c:7084: warning: no previous prototype for 'base_yyget_text'
scan.c:7093: warning: no previous prototype for 'base_yyset_lineno'
scan.c:7105: warning: no previous prototype for 'base_yyset_in'
scan.c:7110: warning: no previous prototype for 'base_yyset_out'
scan.c:7115: warning: no previous prototype for 'base_yyget_debug'
scan.c:7120: warning: no previous prototype for 'base_yyset_debug'
scan.c:7154: warning: no previous prototype for 'base_yylex_destroy'

--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com