Index: tools/prettyprinter/Makefile.am
===================================================================
--- tools/prettyprinter/Makefile.am	(revision b7fe2e689f7d0cda2840a893f55ba1b825e03c45)
+++ tools/prettyprinter/Makefile.am	(revision d9e4d83b688dd3206a646283db627291e33f250c)
@@ -11,6 +11,6 @@
 ## Created On       : Wed Jun 28 12:07:10 2017
 ## Last Modified By : Peter A. Buhr
-## Last Modified On : Mon Apr 16 09:43:23 2018
-## Update Count     : 20
+## Last Modified On : Tue Jan 26 21:54:07 2021
+## Update Count     : 21
 ###############################################################################
 
@@ -20,5 +20,5 @@
 BUILT_SOURCES = parser.hh
 
-AM_YFLAGS = -d -t -v
+AM_YFLAGS = -d -t -v -Wno-yacc
 
 SRC = lex.ll \
Index: tools/prettyprinter/ParserTypes.h
===================================================================
--- tools/prettyprinter/ParserTypes.h	(revision b7fe2e689f7d0cda2840a893f55ba1b825e03c45)
+++ tools/prettyprinter/ParserTypes.h	(revision d9e4d83b688dd3206a646283db627291e33f250c)
@@ -13,11 +13,11 @@
 // Created On       : Sun Dec 16 15:00:49 2001
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Sat Jul 22 10:13:09 2017
-// Update Count     : 175
+// Last Modified On : Tue Jan 26 23:05:34 2021
+// Update Count     : 176
 // 
 
 #pragma once
 
-int yylex();
+extern "C" int yylex();
 
 #include <string>
Index: tools/prettyprinter/parser.yy
===================================================================
--- tools/prettyprinter/parser.yy	(revision b7fe2e689f7d0cda2840a893f55ba1b825e03c45)
+++ tools/prettyprinter/parser.yy	(revision d9e4d83b688dd3206a646283db627291e33f250c)
@@ -10,6 +10,6 @@
 // Created On       : Sat Dec 15 13:44:21 2001
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Sun Apr 15 21:40:30 2018
-// Update Count     : 1052
+// Last Modified On : Tue Jan 26 22:50:03 2021
+// Update Count     : 1053
 // 
 
@@ -17,4 +17,5 @@
 #define YYDEBUG_LEXER_TEXT( yylval )					// lexer loads this up each time
 #define YYDEBUG 1										// get the pretty debugging code to compile
+#define YYERROR_VERBOSE									// more information in syntax errors
 
 #include <iostream>