--- thunderbird-52.6.0/mozglue/misc/StackWalk.cpp
+++ thunderbird-52.6.0/mozglue/misc/StackWalk.cpp
@@ -41,13 +41,7 @@ static CriticalAddress gCriticalAddress;
 #define MOZ_STACKWALK_SUPPORTS_MACOSX 0
 #endif
 
-#if (defined(linux) &&                                            \
-     ((defined(__GNUC__) && (defined(__i386) || defined(PPC))) || \
-      defined(HAVE__UNWIND_BACKTRACE)))
-#  define MOZ_STACKWALK_SUPPORTS_LINUX 1
-#else
 #  define MOZ_STACKWALK_SUPPORTS_LINUX 0
-#endif

 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1)
 #define HAVE___LIBC_STACK_END 1