diff --git a/Android.mk b/Android.mk
index b0d19d9..240b25b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -3,6 +3,7 @@
 
 LOCAL_SRC_FILES:=clatd.c dump.c checksum.c translate.c icmp.c ipv4.c ipv6.c config.c dns64.c logging.c getaddr.c getroute.c netlink_callbacks.c netlink_msg.c setif.c setroute.c mtu.c
 
+LOCAL_CFLAGS := -Wall -Werror
 LOCAL_C_INCLUDES := external/libnl-headers
 LOCAL_STATIC_LIBRARIES := libnl_2
 LOCAL_SHARED_LIBRARIES := libcutils liblog
diff --git a/clatd.c b/clatd.c
index 063026d..b305ef3 100644
--- a/clatd.c
+++ b/clatd.c
@@ -47,8 +47,6 @@
 
 #include <private/android_filesystem_config.h>
 
-#include "ipv4.h"
-#include "ipv6.h"
 #include "translate.h"
 #include "clatd.h"
 #include "config.h"
@@ -84,7 +82,7 @@
 /* function: stop_loop
  * signal handler: stop the event loop
  */
-void stop_loop(int signal) {
+void stop_loop() {
   running = 0;
 }
 
diff --git a/ipv4.c b/ipv4.c
index 89e47e4..47f2422 100644
--- a/ipv4.c
+++ b/ipv4.c
@@ -28,7 +28,6 @@
 
 #include "translate.h"
 #include "checksum.h"
-#include "ipv4.h"
 #include "logging.h"
 #include "debug.h"
 #include "dump.h"
diff --git a/ipv4.h b/ipv4.h
deleted file mode 100644
index 00befd2..0000000
--- a/ipv4.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Copyright 2011 Daniel Drown
- *
- * 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.
- *
- * ipv4.h - takes an ipv4 packet and hands it off to the proper translate function
- */
-#ifndef __IPV4_H__
-#define __IPV4_H__
-
-#include "translate.h"
-
-int ipv4_packet(clat_packet out, int pos, const char *packet, size_t len);
-
-#endif /* __IPV4_H__ */
diff --git a/ipv6.c b/ipv6.c
index ef1e62f..9eaa6ab 100644
--- a/ipv6.c
+++ b/ipv6.c
@@ -29,7 +29,6 @@
 
 #include "translate.h"
 #include "checksum.h"
-#include "ipv6.h"
 #include "logging.h"
 #include "dump.h"
 #include "config.h"
@@ -43,8 +42,7 @@
  * len      - size of ip payload
  * returns: the highest position in the output clat_packet that's filled in
  */
-int icmp6_packet(clat_packet out, int pos, const struct icmp6_hdr *icmp6, uint32_t checksum,
-                 size_t len) {
+int icmp6_packet(clat_packet out, int pos, const struct icmp6_hdr *icmp6, size_t len) {
   const char *payload;
   size_t payload_size;
 
@@ -56,7 +54,7 @@
   payload = (const char *) (icmp6 + 1);
   payload_size = len - sizeof(struct icmp6_hdr);
 
-  return icmp6_to_icmp(out, pos, icmp6, checksum, payload, payload_size);
+  return icmp6_to_icmp(out, pos, icmp6, payload, payload_size);
 }
 
 /* function: log_bad_address
@@ -64,16 +62,18 @@
  * fmt     - printf-style format, use %s to place the address
  * badaddr - the bad address in question
  */
-void log_bad_address(const char *fmt, const struct in6_addr *src, const struct in6_addr *dst) {
 #if CLAT_DEBUG
+void log_bad_address(const char *fmt, const struct in6_addr *src, const struct in6_addr *dst) {
   char srcstr[INET6_ADDRSTRLEN];
   char dststr[INET6_ADDRSTRLEN];
 
   inet_ntop(AF_INET6, src, srcstr, sizeof(srcstr));
   inet_ntop(AF_INET6, dst, dststr, sizeof(dststr));
   logmsg_dbg(ANDROID_LOG_ERROR, fmt, srcstr, dststr);
-#endif
 }
+#else
+#define log_bad_address(fmt, src, dst)
+#endif
 
 /* function: ipv6_packet
  * takes an ipv6 packet and hands it off to the layer 4 protocol function
@@ -138,8 +138,7 @@
 
   // does not support IPv6 extension headers, this will drop any packet with them
   if(protocol == IPPROTO_ICMP) {
-    iov_len = icmp6_packet(out, pos + 1, (const struct icmp6_hdr *) next_header, checksum,
-                           len_left);
+    iov_len = icmp6_packet(out, pos + 1, (const struct icmp6_hdr *) next_header, len_left);
   } else if(ip6->ip6_nxt == IPPROTO_TCP) {
     iov_len = tcp_packet(out, pos + 1, (const struct tcphdr *) next_header, checksum,
                          len_left);
diff --git a/ipv6.h b/ipv6.h
deleted file mode 100644
index 019de17..0000000
--- a/ipv6.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Copyright 2011 Daniel Drown
- *
- * 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.
- *
- * ipv6.h - takes an ipv6 packet and hands it off to the proper translate function
- */
-#ifndef __IPV6_H__
-#define __IPV6_H__
-
-#include "translate.h"
-
-int ipv6_packet(clat_packet out, int pos, const char *packet, size_t len);
-
-#endif /* __IPV6_H__ */
diff --git a/translate.c b/translate.c
index fc70f3d..75ad08a 100644
--- a/translate.c
+++ b/translate.c
@@ -149,7 +149,7 @@
   // Third-party ICMPv6 message. This may have been originated by an native IPv6 address.
   // In that case, the source IPv6 address can't be translated and we need to make up an IPv4
   // source address. For now, use 255.0.0.<ttl>, which at least looks useful in traceroute.
-  if (ip->saddr == (uint32_t) INADDR_NONE) {
+  if ((uint32_t) ip->saddr == INADDR_NONE) {
     ttl_guess = icmp_guess_ttl(old_header->ip6_hlim);
     ip->saddr = htonl((0xff << 24) + ttl_guess);
   }
@@ -236,12 +236,11 @@
  * translate ipv6 icmp to ipv4 icmp
  * out          - output packet
  * icmp6        - source packet icmp6 header
- * checksum     - pseudo-header checksum (unused)
  * payload      - icmp6 payload
  * payload_size - size of payload
  * returns: the highest position in the output clat_packet that's filled in
  */
-int icmp6_to_icmp(clat_packet out, int pos, const struct icmp6_hdr *icmp6, uint32_t checksum,
+int icmp6_to_icmp(clat_packet out, int pos, const struct icmp6_hdr *icmp6,
                   const char *payload, size_t payload_size) {
   struct icmphdr *icmp_targ = out[pos].iov_base;
   uint8_t icmp_type;
diff --git a/translate.h b/translate.h
index fded251..c4d8ede 100644
--- a/translate.h
+++ b/translate.h
@@ -47,10 +47,14 @@
 void fill_ip6_header(struct ip6_hdr *ip6, uint16_t payload_len, uint8_t protocol,
                      const struct iphdr *old_header);
 
+// Translate IPv4 and IPv6 packets.
+int ipv4_packet(clat_packet out, int pos, const char *packet, size_t len);
+int ipv6_packet(clat_packet out, int pos, const char *packet, size_t len);
+
 // Translate ICMP packets.
 int icmp_to_icmp6(clat_packet out, int pos, const struct icmphdr *icmp, uint32_t checksum,
                   const char *payload, size_t payload_size);
-int icmp6_to_icmp(clat_packet out, int pos, const struct icmp6_hdr *icmp6, uint32_t checksum,
+int icmp6_to_icmp(clat_packet out, int pos, const struct icmp6_hdr *icmp6,
                   const char *payload, size_t payload_size);
 
 // Translate TCP and UDP packets.