From 1ed329073eb786b2958f723b859c6f99cbe85d98 Mon Sep 17 00:00:00 2001
From: Reuben Thomas <rrt@sc3d.org>
Date: Wed, 17 Oct 2012 21:34:38 +0100
Subject: algo.h: fix to make it work on Lua 5.1; oops

---
 src/algo.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/algo.h b/src/algo.h
index 4a0afb3..488cad7 100644
--- a/src/algo.h
+++ b/src/algo.h
@@ -134,7 +134,11 @@ static void check_subject (lua_State *L, int pos, TArgExec *argE)
                   lua_typename (L, type));
     argE->text = lua_touserdata (L, -1);
     lua_pop (L, 1);
+#if LUA_VERSION_NUM == 501
+    lua_objlen (L, pos);
+#else
     lua_len (L, pos);
+#endif
     type = lua_type (L, -1);
     if (type != LUA_TNUMBER)
       luaL_error (L, "subject's length is %s (expected number)",
-- 
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