diff --git a/include/stddef.h b/include/stddef.h
new file mode 100644
index 00000000..fa5972fa
--- /dev/null
+++ b/include/stddef.h
@@ -0,0 +1,33 @@
+/* 
+ * Copyright 2010 Stefan Lankes, Chair for Operating Systems,
+ *                               RWTH Aachen University
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of MetalSVM.
+ */
+
+#ifndef __ANSI_STDDEF_H__
+#define __ANSI_STDDEF_H__
+
+#include <metalsvm/stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/include/string.h b/include/string.h
new file mode 100644
index 00000000..750f474a
--- /dev/null
+++ b/include/string.h
@@ -0,0 +1,33 @@
+/* 
+ * Copyright 2010 Stefan Lankes, Chair for Operating Systems,
+ *                               RWTH Aachen University
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of MetalSVM.
+ */
+
+#ifndef __ANSI_STRING_H__
+#define __ANSI_STRING_H__
+
+#include <metalsvm/string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lwip/Makefile b/lwip/Makefile
index 8070e61b..214af6e1 100644
--- a/lwip/Makefile
+++ b/lwip/Makefile
@@ -1,7 +1,7 @@
 SUBDIRS = src
 
-defaul:
-	$(MAKE) all
+default:
+	for i in $(SUBDIRS); do $(MAKE) -C $$i default; done
 
 all:
 	for i in $(SUBDIRS); do $(MAKE) -C $$i all; done
diff --git a/lwip/src/api/Makefile b/lwip/src/api/Makefile
index 27dccb42..0f09bd66 100644
--- a/lwip/src/api/Makefile
+++ b/lwip/src/api/Makefile
@@ -6,15 +6,10 @@ OBJS += $(patsubst %.c, %.o, $(filter %.c, $(C_source)))
 %.o : %.c
 	$(CC) -c $(CFLAGS) -o $@ $< 
 
-default:
-	$(MAKE) all
-
-all:
-	$(MAKE) $(LIBLWIP)
-
-$(LIBLWIP): $(OBJS)
-	$(AR) $(ARFLAGS) $(LIBLWIP) $(OBJS)
-
+default: $(OBJS)
+	
+all: $(OBJS)
+	
 clean:
 	$(RM) *.o *~
 
diff --git a/lwip/src/core/Makefile b/lwip/src/core/Makefile
index 3111abfc..4f4c120c 100644
--- a/lwip/src/core/Makefile
+++ b/lwip/src/core/Makefile
@@ -7,16 +7,11 @@ OBJS += $(patsubst %.c, %.o, $(filter %.c, $(C_source)))
 %.o : %.c
 	$(CC) -c $(CFLAGS) -o $@ $< 
 
-default:
+default: $(OBJS)
 	for i in $(SUBDIRS); do $(MAKE) -C $$i default; done
-	$(MAKE) all
 
-all:
+all: $(OBJS)
 	for i in $(SUBDIRS); do $(MAKE) -C $$i all; done
-	$(MAKE) $(LIBLWIP)
-
-$(LIBLWIP): $(OBJS)
-	$(AR) $(ARFLAGS) $(LIBLWIP) $(OBJS)
 
 clean:
 	for i in $(SUBDIRS); do $(MAKE) -C $$i clean; done
diff --git a/lwip/src/core/ipv4/Makefile b/lwip/src/core/ipv4/Makefile
index de3fb439..f042189d 100644
--- a/lwip/src/core/ipv4/Makefile
+++ b/lwip/src/core/ipv4/Makefile
@@ -6,15 +6,10 @@ OBJS += $(patsubst %.c, %.o, $(filter %.c, $(C_source)))
 %.o : %.c
 	$(CC) -c $(CFLAGS) -o $@ $< 
 
-default:
-	$(MAKE) all
-
-all:
-	$(MAKE) $(LIBLWIP)
-
-$(LIBLWIP): $(OBJS)
-	$(AR) $(ARFLAGS) $(LIBLWIP) $(OBJS)
+default: $(OBJS)
 
+all: $(OBJS)
+	
 clean:
 	$(RM) *.o *~ 
 
diff --git a/lwip/src/netif/Makefile b/lwip/src/netif/Makefile
index f7aff504..1e87c3f6 100644
--- a/lwip/src/netif/Makefile
+++ b/lwip/src/netif/Makefile
@@ -6,15 +6,10 @@ OBJS += $(patsubst %.c, %.o, $(filter %.c, $(C_source)))
 %.o : %.c
 	$(CC) -c $(CFLAGS) -o $@ $< 
 
-default:
-	$(MAKE) all
-
-all:
-	$(MAKE) $(LIBLWIP)
-
-$(LIBLWIP): $(OBJS)
-	$(AR) $(ARFLAGS) $(LIBLWIP) $(OBJS)
-
+default: $(OBJS)
+	
+all: $(OBJS)
+	
 clean:
 	$(RM) *.o *~