bip: FTBFS: lex.l:19:6: error: conflicting types for 'yyparse'

Imported from Debian bug http://bugs.debian.org/710614:

Source: bip
Version: 0.8.8-2
Severity: serious
Tags: jessie sid
User: <email address hidden>
Usertags: qa-ftbfs-20130529 qa-ftbfs
Justification: FTBFS on amd64

Hi,

During a rebuild of all packages in sid, your package failed to build on
amd64.

Relevant part:
> gcc -DHAVE_CONFIG_H -I. -I./src -O2 -g -W -Wall -fPIE -c -o src/lex.o src/lex.c
> lex.l:19:6: error: conflicting types for 'yyparse'
> In file included from lex.l:15:0:
> src/conf.h:201:5: note: previous declaration of 'yyparse' was here
> src/lex.c:1681:17: warning: 'yyunput' defined but not used [-Wunused-function]
> src/lex.c:1722:16: warning: 'input' defined but not used [-Wunused-function]
> make[2]: *** [src/lex.o] Error 1

The full build log is available from:
   http://deiv.vzpla.net/logs/2013/05/29/bip_0.8.8-2_unstable.log

You can find more information on this bug report:
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=691928

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.