diff --git a/cpu/native/include/nativenet.h b/cpu/native/include/nativenet.h
index bbc4120eda..729703cf80 100644
--- a/cpu/native/include/nativenet.h
+++ b/cpu/native/include/nativenet.h
@@ -32,7 +32,11 @@
 
 #ifndef NATIVE_MAX_DATA_LENGTH
 #include "tap.h"
+#ifdef MODULE_SIXLOWPAN
+#define NATIVE_MAX_DATA_LENGTH (255)
+#else
 #define NATIVE_MAX_DATA_LENGTH (TAP_MAX_DATA)
+#endif
 #else
 #warning be careful not to exceed (TAP_MAX_DATA) with NATIVE_MAX_DATA_LENGTH
 #endif /* NATIVE_MAX_DATA_LENGTH */
diff --git a/sys/net/rpl/of_mrhof.c b/sys/net/rpl/of_mrhof.c
index 8c6fec2b74..56771ea288 100644
--- a/sys/net/rpl/of_mrhof.c
+++ b/sys/net/rpl/of_mrhof.c
@@ -20,6 +20,8 @@ rpl_of_t rpl_of_mrhof = {
     which_parent,
     which_dodag,
     reset,
+    NULL,
+    NULL,
     NULL
 };
 
@@ -30,6 +32,7 @@ rpl_of_t *rpl_get_of_mrhof(void)
 
 void reset(rpl_dodag_t *dodag)
 {
+    (void) dodag;
 }
 
 static uint16_t calc_path_cost(rpl_parent_t *parent)
@@ -171,5 +174,6 @@ static rpl_parent_t *which_parent(rpl_parent_t *p1, rpl_parent_t *p2)
 //Not used yet, as the implementation only makes use of one dodag for now.
 static rpl_dodag_t *which_dodag(rpl_dodag_t *d1, rpl_dodag_t *d2)
 {
+    (void) d2;
     return d1;
 }
diff --git a/sys/net/sixlowpan/bordermultiplex.c b/sys/net/sixlowpan/bordermultiplex.c
index 4998530e08..34e76c1b57 100644
--- a/sys/net/sixlowpan/bordermultiplex.c
+++ b/sys/net/sixlowpan/bordermultiplex.c
@@ -141,7 +141,7 @@ int readpacket(uint8_t *packet_buf, size_t size)
             break;
         }
 
-        if ((line_buf_ptr - packet_buf) >= size - 1) {
+        if ((size_t) (line_buf_ptr - packet_buf) >= size - 1) {
             return -SIXLOWERROR_ARRAYFULL;
         }
 
@@ -179,8 +179,8 @@ int writepacket(uint8_t *packet_buf, size_t size)
 {
     uint8_t *byte_ptr = packet_buf;
 
-    while ((byte_ptr - packet_buf) < size) {
-        if ((byte_ptr - packet_buf) > BORDER_BUFFER_SIZE) {
+    while ((size_t) (byte_ptr - packet_buf) < size) {
+        if ((size_t) (byte_ptr - packet_buf) > BORDER_BUFFER_SIZE) {
             return -1;
         }
 
diff --git a/sys/net/sixlowpan/icmp.c b/sys/net/sixlowpan/icmp.c
index 4062de8719..faaac7fb64 100644
--- a/sys/net/sixlowpan/icmp.c
+++ b/sys/net/sixlowpan/icmp.c
@@ -381,7 +381,7 @@ void recv_echo_req(void)
     printf("\n");
     printf("id = 0x%04x, seq = %d\n", echo_buf->id, echo_buf->seq);
 
-    for (int i = 0; i < data_len; i++) {
+    for (size_t i = 0; i < data_len; i++) {
         printf("%02x ", echo_data_buf[i]);
 
         if ((i + 1) % 16 || i == data_len - 1) {
@@ -408,7 +408,7 @@ void recv_echo_repl(void)
     printf("\n");
     printf("id = 0x%04x, seq = %d\n", echo_buf->id, echo_buf->seq);
 
-    for (int i = 0; i < data_len; i++) {
+    for (size_t i = 0; i < data_len; i++) {
         printf("%02x ", echo_data_buf[i]);
 
         if ((i + 1) % 16 || i == data_len - 1) {
@@ -1566,7 +1566,7 @@ void def_rtr_lst_rem(ndp_default_router_list_t *entry)
 //------------------------------------------------------------------------------
 /* prefix list functions */
 
-int8_t plist_add(ipv6_addr_t *addr, uint8_t size, uint32_t val_ltime,
+int plist_add(ipv6_addr_t *addr, uint8_t size, uint32_t val_ltime,
                  uint32_t pref_ltime, uint8_t adv_opt, uint8_t l_a_reserved1)
 {
     if (prefix_count == OPT_PI_LIST_LEN) {
diff --git a/sys/net/sixlowpan/icmp.h b/sys/net/sixlowpan/icmp.h
index 7840704cc0..297b18e060 100644
--- a/sys/net/sixlowpan/icmp.h
+++ b/sys/net/sixlowpan/icmp.h
@@ -53,7 +53,7 @@ void recv_nbr_adv(void);
 void recv_nbr_sol(void);
 
 void nbr_cache_auto_rem(void);
-int8_t plist_add(ipv6_addr_t *addr, uint8_t size, uint32_t val_ltime,
+int plist_add(ipv6_addr_t *addr, uint8_t size, uint32_t val_ltime,
                  uint32_t pref_ltime, uint8_t adv_opt, uint8_t l_a_reserved1);
 
 ndp_a6br_cache_t *abr_add_context(uint16_t version, ipv6_addr_t *abr_addr,
diff --git a/sys/net/sixlowpan/lowpan.c b/sys/net/sixlowpan/lowpan.c
index 970af94397..1a3b88339e 100644
--- a/sys/net/sixlowpan/lowpan.c
+++ b/sys/net/sixlowpan/lowpan.c
@@ -1637,7 +1637,7 @@ void init_reas_bufs(lowpan_reas_buf_t *buf)
 void sixlowpan_lowpan_init(transceiver_type_t trans, uint8_t r_addr,
                            int as_border)
 {
-    lowpan_init(trans, r_addr, NULL, 0);
+    lowpan_init(trans, r_addr, NULL, as_border);
 }
 
 void sixlowpan_lowpan_adhoc_init(transceiver_type_t trans,
diff --git a/sys/shell/commands/Makefile b/sys/shell/commands/Makefile
index 259a61aa2d..83b0a54213 100644
--- a/sys/shell/commands/Makefile
+++ b/sys/shell/commands/Makefile
@@ -1,4 +1,4 @@
-SRC = shell_commands.c sc_id.c sc_heap.c
+SRC = shell_commands.c sc_id.c
 INCLUDES = -I../../../core/include -I../../include -I../../../drivers/include/
 
 ifneq (,$(findstring cc110x_ng,$(USEMODULE)))
@@ -32,6 +32,9 @@ endif
 ifneq (,$(findstring sht11,$(USEMODULE)))
 	SRC += sc_sht11.c
 endif
+ifneq (,$(findstring lpc_common,$(USEMODULE)))
+	SRC += sc_heap.c
+endif
 
 OBJ = $(SRC:%.c=$(BINDIR)%.o)
 DEP = $(SRC:%.c=$(BINDIR)%.d)
diff --git a/sys/shell/commands/sc_heap.c b/sys/shell/commands/sc_heap.c
index a7f4fa8531..7cc9f7a9c3 100644
--- a/sys/shell/commands/sc_heap.c
+++ b/sys/shell/commands/sc_heap.c
@@ -18,8 +18,6 @@
  * @note    $Id: sc_heap.c 3855 2013-09-05 12:40:11 kasmi $
  */
 
-#ifdef MODULE_LPC_COMMON
-
 extern void heap_stats(void);
 
 void _heap_handler(char *unused)
@@ -28,5 +26,3 @@ void _heap_handler(char *unused)
     heap_stats();
 }
 
-#endif
-