https://sourceforge.net/tracker/?func=detail&aid=3546447&group_id=97492&atid=618177
--- flex/tests/test-bison-yylloc/main.c
+++ flex/tests/test-bison-yylloc/main.c
@@ -24,8 +24,6 @@
 #include "parser.h"
 #include "scanner.h"
 
-extern int testparse(yyscan_t);
-
 int main ( int argc, char** argv )
 {
     yyscan_t scanner;
--- flex/tests/test-bison-yylloc/parser.y
+++ flex/tests/test-bison-yylloc/parser.y
@@ -21,6 +21,8 @@
  * PURPOSE.
  */
 
+%parse-param { void* scanner }
+
 /* 
    How to compile:
    bison --defines --output-file="parser.c" --name-prefix="test" parser.y
@@ -32,10 +34,8 @@
 #include "config.h"
 
 #define YYERROR_VERBOSE 1
-#define YYPARSE_PARAM scanner
 #define YYLEX_PARAM   scanner
 
-int yyerror(char* msg);
 extern int testget_lineno(void*);
 
 
@@ -89,7 +89,7 @@ line:
 
 %%
 
-int yyerror(char* msg) {
+int yyerror(void* scanner, char* msg) {
     fprintf(stderr,"%s\n",msg);
     return 0;
 }
--- flex/tests/test-bison-yylval/main.c
+++ flex/tests/test-bison-yylval/main.c
@@ -24,8 +24,6 @@
 #include "parser.h"
 #include "scanner.h"
 
-extern int testparse(yyscan_t);
-
 int main ( int argc, char** argv )
 {
     yyscan_t scanner;
--- flex/tests/test-bison-yylval/parser.y
+++ flex/tests/test-bison-yylval/parser.y
@@ -25,6 +25,7 @@
    How to compile:
    bison --defines --output-file="parser.c" --name-prefix="test" parser.y
  */
+%parse-param { void* scanner }
 %{
 #include <stdio.h>
 #include <stdlib.h>
@@ -32,11 +33,8 @@
 #include "config.h"
 
 #define YYERROR_VERBOSE 1
-#define YYPARSE_PARAM scanner
 #define YYLEX_PARAM   scanner
 
-int yyerror(char* msg);
-
 
 /* A dummy function. A check against seg-faults in yylval->str. */
 int process_text(char* s) {
@@ -76,7 +74,7 @@ starttag:  LT      TAGNAME GT { process_text($2); free($2);} ;
 endtag:    LTSLASH TAGNAME GT { process_text($2);free($2);} ;
 %%
 
-int yyerror(char* msg) {
+int yyerror(void* scanner, char* msg) {
     fprintf(stderr,"%s\n",msg);
     return 0;
 }