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error: unknown type name ‘yyscan_t’

# make
bison json_parser.y
flex json_scanner.l
gcc -Wall main.c json_parser.tab.c json_scanner.yy.c -o jsonval
In file included from main.c:23:0:
json_parser.tab.h:65:14: error: unknown type name ‘yyscan_t’
 int yyparse (yyscan_t scanner);
              ^
In file included from json_parser.y:21:0:
json_parser.tab.h:65:14: error: unknown type name ‘yyscan_t’
 int yyparse (yyscan_t scanner);
              ^
json_scanner.yy.c:1295:16: warning: ‘input’ defined but not used [-Wunused-function]
     static int input  (yyscan_t yyscanner)
                ^
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 1

# flex --version
flex 2.6.0

# gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.2) 5.4.0 20160609

# uname -a
Linux ThinkPad-Ubuntu 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:42:33 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux