Add a new header file that provides function prototypes for flex/bison
integration.  This avoids implicit function declarations and build
failures with future compilers.

diff --git a/src/acllex.l b/src/acllex.l
index 74dd8882f2fed262..3ab5e3c0cd897f70 100644
--- a/src/acllex.l
+++ b/src/acllex.l
@@ -11,6 +11,7 @@
 
 #include "acl2.h"
 #include "aclyacc.h"
+#include "aclparse.h"
 %}
 
 byte	([0-9]+)
diff --git a/src/aclparse.h b/src/aclparse.h
new file mode 100644
index 0000000000000000..f113fc26d7513042
--- /dev/null
+++ b/src/aclparse.h
@@ -0,0 +1,3 @@
+int yylex (void);
+void yyerror(const char *msg);
+int yyparse (void);
diff --git a/src/aclyacc.y b/src/aclyacc.y
index 60001b6e4c820271..711b7eb169b59aba 100644
--- a/src/aclyacc.y
+++ b/src/aclyacc.y
@@ -2,6 +2,7 @@
 #include <ftlib.h>
 #include "acl2.h"
 #include <stdio.h> /* XXX REMOVE */
+#include "aclparse.h"
 
 /* XXX remove */
 unsigned char fmt_buf[32];
diff --git a/src/flow-filter.c b/src/flow-filter.c
index 3c1bfea989b2a129..305e2ed4399ca33d 100644
--- a/src/flow-filter.c
+++ b/src/flow-filter.c
@@ -47,6 +47,7 @@
 #endif
 
 #include "acl2.h"
+#include "aclparse.h"
 
 /*
  * TODO
@@ -58,9 +59,7 @@ int ip_net_only;
 
 extern struct acl_list acl_list;
 
-int yyparse (void);
 void usage(void);
-void yyerror(const char *msg);
 
 extern FILE *yyin;
 extern char *yytext;