diff --git a/mozilla/xpcom/base/nsStackFrameUnix.cpp b/mozilla/xpcom/base/nsStackFrameUnix.cpp
index 1b81f99859d..5ce8111f33f 100644
--- a/mozilla/xpcom/base/nsStackFrameUnix.cpp
+++ b/mozilla/xpcom/base/nsStackFrameUnix.cpp
@@ -82,20 +82,9 @@ void DemangleSymbol(const char * aSymbol,
 #endif // MOZ_DEMANGLE_SYMBOLS
 }
 
-#if defined(linux) // Linux
-#if (__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 3)) // use glibc backtrace()
-#include <execinfo.h>
-void DumpStackToFile(FILE* aStream)
-{
-  void *array[20];
-  size_t size;
 
-  fflush(aStream);
-  size = backtrace (array, 20);
-  backtrace_symbols_fd (array, size, fileno(aStream));
-}
+#if defined(linux) && defined(__GLIBC__) && (defined(__i386) || defined(PPC)) // i386 or PPC Linux stackwalking code
 
-#elif defined(__GLIBC__) && (defined(__i386) || defined(PPC)) // old style i386 or PPC Linux stackwalking code
 #include <setjmp.h>
 //
 
@@ -151,13 +140,6 @@ void DumpStackToFile(FILE* aStream)
   }
 }
 
-#else // not implemented
-void DumpStackToFile(FILE* aStream)
-{
-  fprintf(aStream, "Info: Stacktrace not implemented for this Linux platform\n");
-}
-#endif // Linux
-
 #elif defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386))
 
 /*
diff --git a/mozilla/xpcom/base/nsTraceRefcntImpl.cpp b/mozilla/xpcom/base/nsTraceRefcntImpl.cpp
index e3d99e9b456..c86fb5f4f02 100644
--- a/mozilla/xpcom/base/nsTraceRefcntImpl.cpp
+++ b/mozilla/xpcom/base/nsTraceRefcntImpl.cpp
@@ -828,8 +828,8 @@ nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
 }
 
 // WIN32 x86 stack walking code
-// Linux stackwalking code or Solaris
-#elif (defined(linux) && defined(__GLIBC__)) || (defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386)))
+// i386 or PPC Linux stackwalking code or Solaris
+#elif (defined(linux) && defined(__GLIBC__) && (defined(__i386) || defined(PPC))) || (defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386)))
 #include "nsStackFrameUnix.h"
 void
 nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
diff --git a/mozilla/xpfe/bootstrap/nsSigHandlers.cpp b/mozilla/xpfe/bootstrap/nsSigHandlers.cpp
index d082e440d35..80c32a91247 100644
--- a/mozilla/xpfe/bootstrap/nsSigHandlers.cpp
+++ b/mozilla/xpfe/bootstrap/nsSigHandlers.cpp
@@ -75,7 +75,7 @@
 
 static char _progname[1024] = "huh?";
 
-#if defined(LINUX) && defined(DEBUG) && defined(__GLIBC__)
+#if defined(LINUX) && defined(DEBUG) && (defined(__i386) || defined(PPC))
 #define CRAWL_STACK_ON_SIGSEGV
 #endif