use the copyright statement provided by the Lua distribution in lua.h

include/decl.h

@@ -701,6 +701,7 @@ struct role_filter {
 #define CVT_BUF_SIZE 64
 
 #define LUA_VER_BUFSIZ 20
+#define LUA_COPYRIGHT_BUFSIZ 120
 
 struct instance_globals {
 
@@ -1257,6 +1258,7 @@ struct instance_globals {
 
     /* new stuff */
     char lua_ver[LUA_VER_BUFSIZ];
+    char lua_copyright[LUA_COPYRIGHT_BUFSIZ];
 
     unsigned long magic; /* validate that structure layout is preserved */
 };

src/decl.c

@@ -693,6 +693,7 @@ const struct instance_globals g_init = {
 
     /* new */
     DUMMY,   /* lua_ver[LUA_VER_BUFSIZ] */
+    DUMMY,   /* lua_copyright[LUA_COPYRIGHT_BUFSIZ] */
 
     IVMAGIC  /* used to validate that structure layout has been preserved */
 };

src/mdlib.c

@@ -637,7 +637,7 @@ build_options()
     {
         static const char *lua_info[] = {
  "", "NetHack 3.7.* uses the 'Lua' interpreter to process some data:", "",
- "    About Lua:LUAVERSION:: Copyright (c) 1994-2017 Lua.org, PUC-Rio.", "",
+ "    :LUACOPYRIGHT:", "",
  /*        1         2         3         4         5         6         7
   1234567890123456789012345678901234567890123456789012345678901234567890123456
   */

src/nhlua.c

@@ -923,6 +923,10 @@ get_lua_version()
                 Strcpy(g.lua_ver, vs);
         }
         lua_close(L);
+#ifdef LUA_COPYRIGHT
+        if (sizeof LUA_COPYRIGHT < sizeof g.lua_copyright - 1)
+            Strcpy(g.lua_copyright, LUA_COPYRIGHT);
+#endif
     }
     return (const char *) g.lua_ver;
 }

src/version.c

@@ -304,6 +304,9 @@ static struct rt_opt {
 } rt_opts[] = {
     { ":PATMATCH:", regex_id },
     { ":LUAVERSION:", (const char *) g.lua_ver + 3 }, /* +3 skip past "Lua" */
+#ifdef LUA_COPYRIGHT
+    { ":LUACOPYRIGHT:", (const char *) g.lua_copyright },
+#endif
 };
 
 /*
@@ -320,10 +323,11 @@ char *buf;
 
     if (!g.lua_ver[0])
         get_lua_version();
-        
+
     for (i = 0; i < SIZE(rt_opts); ++i) {
-        if (strstri(buf, rt_opts[i].token) && *rt_opts[i].value)
+        if (strstri(buf, rt_opts[i].token) && *rt_opts[i].value) {
             (void) strsubst(buf, rt_opts[i].token, rt_opts[i].value);
+	}
         /* we don't break out of the loop after a match; there might be
            other matches on the same line */
     }