--- thunderbird-52.6.0/mozglue/misc/StackWalk.cpp
+++ thunderbird-52.6.0/mozglue/misc/StackWalk.cpp
@@ -50,13 +50,6 @@ static CriticalAddress gCriticalAddress;
 #  define HAVE___LIBC_STACK_END 0
 #endif
 
-#if (defined(linux) &&                                            \
-     ((defined(__GNUC__) && (defined(__i386) || defined(PPC))) || \
-      defined(HAVE__UNWIND_BACKTRACE)) &&                         \
-     (HAVE___LIBC_STACK_END || ANDROID))
-#  define MOZ_STACKWALK_SUPPORTS_LINUX 1
-#else
 #  define MOZ_STACKWALK_SUPPORTS_LINUX 0
-#endif
 
 #if HAVE___LIBC_STACK_END