diff --git a/luprex/eris-master/src/lapi.c b/luprex/eris-master/src/lapi.c
index cf79e72a..7fd8409f 100644
--- a/luprex/eris-master/src/lapi.c
+++ b/luprex/eris-master/src/lapi.c
@@ -312,6 +312,28 @@ LUA_API void lua_arith (lua_State *L, int op) {
   lua_unlock(L);
 }
 
+LUA_API int lua_genlt (lua_State *L, int index1, int index2) {
+  StkId o1, o2;
+  int i = 0;
+  lua_lock(L);  /* may call tag method */
+  o1 = index2addr(L, index1);
+  o2 = index2addr(L, index2);
+  int t1 = ttypenv(o1);
+  int t2 = ttypenv(o2);
+  if (t1 != t2) {
+    i = (t1 < t2);
+  } else if (t1 == LUA_TNUMBER) {
+    i = luai_numlt(L, nvalue(o1), nvalue(o2));
+  } else if (t1 == LUA_TSTRING) {
+    i = luaV_lessthan(L, o1, o2);
+  } else if (t1 == LUA_TBOOLEAN) {
+    i = bvalue(o1) < bvalue(o2);
+  } else {
+    luaG_ordererror(L, o1, o2);
+  }
+  lua_unlock(L);
+  return i;
+}
 
 LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
   StkId o1, o2;
diff --git a/luprex/eris-master/src/lbaselib.c b/luprex/eris-master/src/lbaselib.c
index bcd521d0..cfebd58e 100644
--- a/luprex/eris-master/src/lbaselib.c
+++ b/luprex/eris-master/src/lbaselib.c
@@ -20,6 +20,11 @@
 #include "lualib.h"
 
 
+static int luaB_printaddr (lua_State *L) {
+  int n = lua_gettop(L);
+  
+}
+
 static int luaB_print (lua_State *L) {
   int n = lua_gettop(L);  /* number of arguments */
   int i;
diff --git a/luprex/eris-master/src/lua.h b/luprex/eris-master/src/lua.h
index 2534f6d6..26ca1a99 100644
--- a/luprex/eris-master/src/lua.h
+++ b/luprex/eris-master/src/lua.h
@@ -199,7 +199,7 @@ LUA_API void  (lua_arith) (lua_State *L, int op);
 
 LUA_API int   (lua_rawequal) (lua_State *L, int idx1, int idx2);
 LUA_API int   (lua_compare) (lua_State *L, int idx1, int idx2, int op);
-
+LUA_API int   (lua_genlt) (lua_State *L, int idx1, int idx2);
 
 /*
 ** push functions (C -> stack)