diff --git a/luprex/eris-master/src/lua.c b/luprex/eris-master/src/lua.c
index 540c6e6f..3b009fa0 100644
--- a/luprex/eris-master/src/lua.c
+++ b/luprex/eris-master/src/lua.c
@@ -83,15 +83,6 @@
 #endif
 
 
-void luai_writestring(const char *s, size_t len) {
-    fwrite((s), sizeof(char), (len), stdout);
-}
-
-void luai_writeline() {
-    fwrite("\n", sizeof(char), 1, stdout);
-    fflush(stdout);
-}
-
 static lua_State *globalL = NULL;
 
 static const char *progname = LUA_PROGNAME;
diff --git a/luprex/eris-master/src/luaconf.h b/luprex/eris-master/src/luaconf.h
index 730dae6c..e5e103cc 100644
--- a/luprex/eris-master/src/luaconf.h
+++ b/luprex/eris-master/src/luaconf.h
@@ -210,8 +210,9 @@
 ** avoids including 'stdio.h' everywhere.)
 */
 #if defined(LUA_LIB) || defined(lua_c)
-extern void luai_writestring(const char *s, size_t len);
-extern void luai_writeline();
+#include <stdio.h>
+#define luai_writestring(s,l)	fwrite((s), sizeof(char), (l), stdout)
+#define luai_writeline()	(luai_writestring("\n", 1), fflush(stdout))
 #endif
 
 /*
@@ -221,7 +222,6 @@ extern void luai_writeline();
 #define luai_writestringerror(s,p) \
 	(fprintf(stderr, (s), (p)), fflush(stderr))
 
-
 /*
 @@ LUAI_MAXSHORTLEN is the maximum length for short strings, that is,
 ** strings that are internalized. (Cannot be smaller than reserved words
diff --git a/luprex/eris-master/test/persist.c b/luprex/eris-master/test/persist.c
index 24fbbcbb..4f52de43 100644
--- a/luprex/eris-master/test/persist.c
+++ b/luprex/eris-master/test/persist.c
@@ -5,15 +5,6 @@
 #include "lualib.h"
 #include "lauxlib.h"
 
-void luai_writestring(const char *s, size_t len) {
-    fwrite((s), sizeof(char), (len), stdout);
-}
-
-void luai_writeline() {
-    fwrite("\n", sizeof(char), 1, stdout);
-    fflush(stdout);
-}
-
 static int LUAF_createludata(lua_State *L)
 {
 	lua_pushlightuserdata(L, (void*)321);
diff --git a/luprex/eris-master/test/unpersist.c b/luprex/eris-master/test/unpersist.c
index f70562c8..19d312ae 100644
--- a/luprex/eris-master/test/unpersist.c
+++ b/luprex/eris-master/test/unpersist.c
@@ -5,15 +5,6 @@
 #include "lualib.h"
 #include "lauxlib.h"
 
-void luai_writestring(const char *s, size_t len) {
-    fwrite((s), sizeof(char), (len), stdout);
-}
-
-void luai_writeline() {
-    fwrite("\n", sizeof(char), 1, stdout);
-    fflush(stdout);
-}
-
 static int LUAF_checkludata(lua_State *L)
 {
 	lua_pushboolean(L, lua_touserdata(L, -1) == (void*)321);