diff --git a/src/client/ios/Breakpad.xcodeproj/project.pbxproj b/src/client/ios/Breakpad.xcodeproj/project.pbxproj
index 10888c8f..91e1b812 100644
--- a/src/client/ios/Breakpad.xcodeproj/project.pbxproj
+++ b/src/client/ios/Breakpad.xcodeproj/project.pbxproj
@@ -370,6 +370,7 @@
 		0867D690FE84028FC02AAC07 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
+				LastUpgradeCheck = 0510;
 			};
 			buildConfigurationList = 1DEB922208733DC00010E9CD /* Build configuration list for PBXProject "Breakpad" */;
 			compatibilityVersion = "Xcode 3.2";
@@ -439,7 +440,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				ARCHS = "$(ARCHS_STANDARD_INCLUDING_64_BIT)";
 				COPY_PHASE_STRIP = NO;
 				DSTROOT = /tmp/Breakpad.dst;
 				FRAMEWORK_SEARCH_PATHS = (
@@ -471,7 +471,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				ARCHS = "$(ARCHS_STANDARD_INCLUDING_64_BIT)";
 				DSTROOT = /tmp/Breakpad.dst;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
@@ -499,7 +498,6 @@
 		1DEB922308733DC00010E9CD /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_INCLUDING_64_BIT)";
 				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				GCC_C_LANGUAGE_STANDARD = c99;
 				GCC_OPTIMIZATION_LEVEL = 0;
@@ -517,6 +515,8 @@
 					../../client/apple/Framework,
 					../../common/mac,
 				);
+				IPHONEOS_DEPLOYMENT_TARGET = 5.0;
+				ONLY_ACTIVE_ARCH = YES;
 				OTHER_LDFLAGS = "-ObjC";
 				SDKROOT = iphoneos;
 			};
@@ -525,7 +525,6 @@
 		1DEB922408733DC00010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_INCLUDING_64_BIT)";
 				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				GCC_C_LANGUAGE_STANDARD = c99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
@@ -542,6 +541,7 @@
 					../../client/apple/Framework,
 					../../common/mac,
 				);
+				IPHONEOS_DEPLOYMENT_TARGET = 5.0;
 				OTHER_LDFLAGS = "-ObjC";
 				SDKROOT = iphoneos;
 			};
diff --git a/src/client/mac/Framework/Breakpad.mm b/src/client/mac/Framework/Breakpad.mm
index 0b3fa715..fe592bf3 100644
--- a/src/client/mac/Framework/Breakpad.mm
+++ b/src/client/mac/Framework/Breakpad.mm
@@ -102,7 +102,7 @@ class ProtectedMemoryLocker {
       : mutex_(mutex),
         allocator_(allocator) {
     // Lock the mutex
-    int rv = pthread_mutex_lock(mutex_);
+    __attribute__((unused)) int rv = pthread_mutex_lock(mutex_);
     assert(rv == 0);
 
     // Unprotect the memory
@@ -114,7 +114,7 @@ class ProtectedMemoryLocker {
     allocator_->Protect();
 
     // Then unlock the mutex
-    int rv = pthread_mutex_unlock(mutex_);
+    __attribute__((unused)) int rv = pthread_mutex_unlock(mutex_);
     assert(rv == 0);
   };
 
diff --git a/src/client/mac/handler/breakpad_nlist_64.cc b/src/client/mac/handler/breakpad_nlist_64.cc
index fcb667e3..f6e1d95a 100644
--- a/src/client/mac/handler/breakpad_nlist_64.cc
+++ b/src/client/mac/handler/breakpad_nlist_64.cc
@@ -281,7 +281,7 @@ int __breakpad_fdnlist(int fd, nlist_type *list, const char **symbolNames,
 
   off_t sa;  /* symbol address */
   off_t ss;  /* start of strings */
-  register register_t n;
+  register_t n;
   if (*((unsigned int *)&buf) == magic) {
     if (lseek(fd, arch_offset, SEEK_SET) == -1) {
       return -1;
@@ -354,7 +354,7 @@ int __breakpad_fdnlist(int fd, nlist_type *list, const char **symbolNames,
   // and look for a match
   while (n) {
     nlist_type space[BUFSIZ/sizeof (nlist_type)];
-    register register_t m = sizeof (space);
+    register_t m = sizeof (space);
 
     if (n < m)
       m = n;
diff --git a/src/common/md5.cc b/src/common/md5.cc
index 76f8ed14..a0d9a1bd 100644
--- a/src/common/md5.cc
+++ b/src/common/md5.cc
@@ -166,7 +166,7 @@ void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
  */
 static void MD5Transform(u32 buf[4], u32 const in[16])
 {
-  register u32 a, b, c, d;
+  u32 a, b, c, d;
 
   a = buf[0];
   b = buf[1];