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diff -urN nspr-4.9.2/mozilla/nsprpub/pr/include/md/_linux.cfg nspr-4.9.2-aarch64/mozilla/nsprpub/pr/include/md/_linux.cfg
--- nspr-4.9.2/mozilla/nsprpub/pr/include/md/_linux.cfg	2012-05-18 15:55:29.000000000 -0600
+++ nspr-4.9.2-aarch64/mozilla/nsprpub/pr/include/md/_linux.cfg	2012-11-07 14:33:28.442278157 -0700
@@ -812,6 +812,52 @@
 #define PR_BYTES_PER_WORD_LOG2   2
 #define PR_BYTES_PER_DWORD_LOG2  3
 
+#elif defined(__aarch64__)
+
+#define IS_LITTLE_ENDIAN 1
+#undef  IS_BIG_ENDIAN
+#define IS_64
+
+#define PR_BYTES_PER_BYTE   1
+#define PR_BYTES_PER_SHORT  2
+#define PR_BYTES_PER_INT    4
+#define PR_BYTES_PER_INT64  8
+#define PR_BYTES_PER_LONG   8
+#define PR_BYTES_PER_FLOAT  4
+#define PR_BYTES_PER_DOUBLE 8
+#define PR_BYTES_PER_WORD   8
+#define PR_BYTES_PER_DWORD  8
+
+#define PR_BITS_PER_BYTE    8
+#define PR_BITS_PER_SHORT   16
+#define PR_BITS_PER_INT     32
+#define PR_BITS_PER_INT64   64
+#define PR_BITS_PER_LONG    64
+#define PR_BITS_PER_FLOAT   32
+#define PR_BITS_PER_DOUBLE  64
+#define PR_BITS_PER_WORD    64
+
+#define PR_BITS_PER_BYTE_LOG2   3
+#define PR_BITS_PER_SHORT_LOG2  4
+#define PR_BITS_PER_INT_LOG2    5
+#define PR_BITS_PER_INT64_LOG2  6
+#define PR_BITS_PER_LONG_LOG2   6
+#define PR_BITS_PER_FLOAT_LOG2  5
+#define PR_BITS_PER_DOUBLE_LOG2 6
+#define PR_BITS_PER_WORD_LOG2   6
+
+#define PR_ALIGN_OF_SHORT   2
+#define PR_ALIGN_OF_INT     4
+#define PR_ALIGN_OF_LONG    8
+#define PR_ALIGN_OF_INT64   8
+#define PR_ALIGN_OF_FLOAT   4
+#define PR_ALIGN_OF_DOUBLE  8
+#define PR_ALIGN_OF_POINTER 8
+#define PR_ALIGN_OF_WORD    8
+
+#define PR_BYTES_PER_WORD_LOG2  3
+#define PR_BYTES_PER_DWORD_LOG2 3
+
 #else
 
 #error "Unknown CPU architecture"
diff -urN nspr-4.9.2/mozilla/nsprpub/pr/include/md/_linux.h nspr-4.9.2-aarch64/mozilla/nsprpub/pr/include/md/_linux.h
--- nspr-4.9.2/mozilla/nsprpub/pr/include/md/_linux.h	2012-03-06 06:13:52.000000000 -0700
+++ nspr-4.9.2-aarch64/mozilla/nsprpub/pr/include/md/_linux.h	2012-11-07 15:01:29.175016701 -0700
@@ -53,6 +53,8 @@
 #define _PR_SI_ARCHITECTURE "avr32"
 #elif defined(__m32r__)
 #define _PR_SI_ARCHITECTURE "m32r"
+#elif defined(__aarch64__)
+#define _PR_SI_ARCHITECTURE "aarch64"
 #else
 #error "Unknown CPU architecture"
 #endif