Taken from Debian:
https://salsa.debian.org/multimedia-team/taopm/-/raw/master/debian/patches/02-fix-parser-yyerror.diff

Description: Use a constant char, dummy comment.
Author: Tiago Bortoletto Vaz <tiago@debian.org>
Last-Update: 2013-04-17
--- a/taoparse/taoparser.yy
+++ b/taoparse/taoparser.yy
@@ -23,7 +23,7 @@
 #include <stdio.h>
 #include "taoparserdefs.h"
 
-int yyerror(char *s);
+int yyerror(const char *s);
 
 //#ifdef LINUX
 int yylex(void);
@@ -2924,7 +2924,7 @@
     } 
 
 
-int yyerror (char *s)
+int yyerror (const char *s)
     {
     parse_error(what_I_expected_here);
     std::cout << "PARSE_FAILED";
 name='id' value='ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>refs</a><a class='active' href='/guix/log/gnu/packages/forth.scm'>log</a><a href='/guix/tree/gnu/packages/forth.scm?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>tree</a><a href='/guix/commit/gnu/packages/forth.scm?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>commit</a><a href='/guix/diff/gnu/packages/forth.scm?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/forth.scm'>
<input type='hidden' name='id' value='ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>root</a>/<a href='/guix/log/gnu?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>gnu</a>/<a href='/guix/log/gnu/packages?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>packages</a>/<a href='/guix/log/gnu/packages/forth.scm?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf'>forth.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/forth.scm?id=ca3cc238e7b073e700a0b66209b27bf7a7e2cdaf&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>