diff --git a/src/bin/init/Makefile b/src/bin/init/Makefile
index 77a380e..625ee5a 100755
--- a/src/bin/init/Makefile
+++ b/src/bin/init/Makefile
@@ -7,7 +7,7 @@
 G++ = gcc
 
 #Compiler Flags
-CFLAGS = -I../../lib/libc/include
+CFLAGS = -I../../lib/libc/include -fno-builtin
 
 #Linker
 LD = ld
diff --git a/src/bin/ls/Makefile b/src/bin/ls/Makefile
index 869e508..90b426b 100755
--- a/src/bin/ls/Makefile
+++ b/src/bin/ls/Makefile
@@ -7,7 +7,7 @@
 G++ = gcc
 
 #Compiler Flags
-CFLAGS = -I../../lib/libc/include
+CFLAGS = -I../../lib/libc/include -fno-builtin
 
 #Linker
 LD = ld
diff --git a/src/bin/pwd/Makefile b/src/bin/pwd/Makefile
index d470605..d532b4e 100755
--- a/src/bin/pwd/Makefile
+++ b/src/bin/pwd/Makefile
@@ -7,7 +7,7 @@
 G++ = gcc
 
 #Compiler Flags
-CFLAGS = -I../../lib/libc/include
+CFLAGS = -I../../lib/libc/include -fno-builtin
 
 #Linker
 LD = ld
diff --git a/src/bin/shell/Makefile b/src/bin/shell/Makefile
index aadef74..9bb73ec 100755
--- a/src/bin/shell/Makefile
+++ b/src/bin/shell/Makefile
@@ -7,7 +7,7 @@
 G++ = gcc
 
 #Compiler Flags
-CFLAGS = -I../../lib/libc/include
+CFLAGS = -I../../lib/libc/include -fno-builtin
 
 #Linker
 LD = ld
diff --git a/src/bin/test/Makefile b/src/bin/test/Makefile
index 0c87148..ab10905 100755
--- a/src/bin/test/Makefile
+++ b/src/bin/test/Makefile
@@ -7,7 +7,7 @@
 G++ = gcc
 
 #Compiler Flags
-CFLAGS = -I../../lib/libc/include
+CFLAGS = -I../../lib/libc/include -fno-builtin
 
 #Linker
 LD = ld
diff --git a/src/lib/libc/stdio/Makefile b/src/lib/libc/stdio/Makefile
index bf9ba3b..c32a6c4 100755
--- a/src/lib/libc/stdio/Makefile
+++ b/src/lib/libc/stdio/Makefile
@@ -1,7 +1,7 @@
 # $Id$
 # The System Makefile (C) 2002 The UbixOS Project
 
-CFLAGS = #-fno-builtin
+CFLAGS = -fno-builtin
 
 #Compiler
 GCC = gcc