diff --git a/src/google/protobuf/descriptor.h b/src/google/protobuf/descriptor.h
index 9e15779804..33e3af7241 100644
--- a/src/google/protobuf/descriptor.h
+++ b/src/google/protobuf/descriptor.h
@@ -58,6 +58,10 @@
 #include <vector>
 #include <google/protobuf/stubs/common.h>
 
+// TYPE_BOOL is defined in the MacOS's ConditionalMacros.h.
+#ifdef TYPE_BOOL
+#undef TYPE_BOOL
+#endif  // TYPE_BOOL
 
 namespace google {
 namespace protobuf {
diff --git a/src/google/protobuf/stubs/atomicops.h b/src/google/protobuf/stubs/atomicops.h
index b7ac75cc51..988007134e 100644
--- a/src/google/protobuf/stubs/atomicops.h
+++ b/src/google/protobuf/stubs/atomicops.h
@@ -180,6 +180,8 @@ GOOGLE_PROTOBUF_ATOMICOPS_ERROR
 #include <google/protobuf/stubs/atomicops_internals_arm_gcc.h>
 #elif defined(GOOGLE_PROTOBUF_ARCH_MIPS)
 #include <google/protobuf/stubs/atomicops_internals_mips_gcc.h>
+#elif defined(__pnacl__)
+#include <google/protobuf/stubs/atomicops_internals_pnacl.h>
 #else
 GOOGLE_PROTOBUF_ATOMICOPS_ERROR
 #endif
diff --git a/src/google/protobuf/stubs/common.cc b/src/google/protobuf/stubs/common.cc
index 0112d992c6..e604502677 100644
--- a/src/google/protobuf/stubs/common.cc
+++ b/src/google/protobuf/stubs/common.cc
@@ -183,11 +183,11 @@ void LogMessage::Finish() {
   if (level_ != LOGLEVEL_FATAL) {
     InitLogSilencerCountOnce();
     MutexLock lock(log_silencer_count_mutex_);
-    suppress = internal::log_silencer_count_ > 0;
+    suppress = log_silencer_count_ > 0;
   }
 
   if (!suppress) {
-    internal::log_handler_(level_, filename_, line_, message_);
+    log_handler_(level_, filename_, line_, message_);
   }
 
   if (level_ == LOGLEVEL_FATAL) {
diff --git a/src/google/protobuf/stubs/platform_macros.h b/src/google/protobuf/stubs/platform_macros.h
index cba9fbd029..b9c3760fa0 100644
--- a/src/google/protobuf/stubs/platform_macros.h
+++ b/src/google/protobuf/stubs/platform_macros.h
@@ -51,6 +51,9 @@
 #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
 #elif defined(__pnacl__)
 #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
+#elif defined(__ppc__)
+#define GOOGLE_PROTOBUF_ARCH_PPC 1
+#define GOOGLE_PROTOBUF_ARCH_32_BIT 1
 #else
 #error Host architecture was not detected as supported by protobuf
 #endif