Building bison from master fails: "conflicting types for 'code_get_leng'"

[Stefano Lattarini]

When I try to bootstrap and build bison from latest master on my Debian
system, I see this failure:

  ...
  CC       src/src_bison-reduce.o
  CC       src/src_bison-relation.o
  CC       src/src_bison-scan-code-c.o
In file included from src/scan-code-c.c:3:0:
src/scan-code.c:789:11: error: conflicting types for 'code_get_leng'
./src/flex-scanner.h:28:1: note: previous declaration of 'code_get_leng' was 
here
In file included from src/scan-code-c.c:3:0:
src/scan-code.c:2344:11: error: conflicting types for 'code_get_leng'
./src/flex-scanner.h:28:1: note: previous declaration of 'code_get_leng' was 
here
Makefile:3833: recipe for target 'src/src_bison-scan-code-c.o' failed
make[2]: *** [src/src_bison-scan-code-c.o] Error 1

Attached is the config.log.  I'm using Automake and Autoconf from master, and
flex 2.5.36.  Let me know if you need more information.

Regards,
  Stefano

config.log.xz
Description: Binary data