diff --git a/nspr-4.7.1-sparc64.patch b/nspr-4.7.1-sparc64.patch
new file mode 100644
index 0000000..26223dd
--- /dev/null
+++ b/nspr-4.7.1-sparc64.patch
@@ -0,0 +1,72 @@
+diff -up nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.cfg.spot nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.cfg
+--- nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.cfg.spot	2008-10-09 13:04:52.000000000 -0400
++++ nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.cfg	2008-10-09 13:56:25.000000000 -0400
+@@ -331,10 +331,55 @@
+ #define PR_BYTES_PER_WORD_LOG2   2
+ #define PR_BYTES_PER_DWORD_LOG2  3
+ 
+-#elif defined(__sparc__)
++#elif defined(__sparc__) && defined (__arch64__)
+ 
+ #undef	IS_LITTLE_ENDIAN
+ #define	IS_BIG_ENDIAN 1
++#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_INT64   8
++#define PR_ALIGN_OF_LONG    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   2
++#define PR_BYTES_PER_DWORD_LOG2  3
++
++#elif defined(__sparc__)
++
++#undef  IS_LITTLE_ENDIAN
++#define IS_BIG_ENDIAN 1
+ 
+ #define PR_BYTES_PER_BYTE   1
+ #define PR_BYTES_PER_SHORT  2
+diff -up nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.h.spot nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.h
+--- nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.h.spot	2008-10-09 13:13:24.000000000 -0400
++++ nspr-4.7.1/mozilla/nsprpub/pr/include/md/_linux.h	2008-10-09 13:14:43.000000000 -0400
+@@ -63,6 +63,8 @@
+ #define _PR_SI_ARCHITECTURE "x86-64"
+ #elif defined(__mc68000__)
+ #define _PR_SI_ARCHITECTURE "m68k"
++#elif defined(__sparc__) && defined(__arch64__)
++#define _PR_SI_ARCHITECTURE "sparc64"
+ #elif defined(__sparc__)
+ #define _PR_SI_ARCHITECTURE "sparc"
+ #elif defined(__i386__)
diff --git a/nspr.spec b/nspr.spec
index da10415..6e5008a 100644
--- a/nspr.spec
+++ b/nspr.spec
@@ -1,7 +1,7 @@
 Summary:        Netscape Portable Runtime
 Name:           nspr
 Version:        4.7.1
-Release:        0.9.2%{?dist}
+Release:        0.9.3%{?dist}
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 URL:            http://www.mozilla.org/projects/nspr/
 Group:          System Environment/Libraries
@@ -15,6 +15,9 @@ Source1:        nspr.pc.in
 Source2:        nspr-config-vars.in
 
 Patch1:         nspr-config-pc.patch
+# Sent upstream:
+# https://bugzilla.mozilla.org/show_bug.cgi?id=459304
+Patch2:         nspr-4.7.1-sparc64.patch
 
 %description
 NSPR provides platform independence for non-GUI operating system 
@@ -44,6 +47,7 @@ Header files for doing development with the Netscape Portable Runtime.
 
 cp ./mozilla/nsprpub/config/nspr-config.in ./mozilla/nsprpub/config/nspr-config-pc.in
 %patch1 -p0
+%patch2 -p1
 
 cp %{SOURCE2} ./mozilla/nsprpub/config/
 
@@ -131,6 +135,9 @@ done
 %{_bindir}/nspr-config
 
 %changelog
+* Thu Oct  9 2008 Tom "spot" Callaway <tcallawa@redhat.com> - 4.7.1-0.9.3
+- enable support for sparc64
+
 * Tue Sep 30 2008 Dennis Gilmore <dennis@ausil.us> - 4.7.1-0.9.2
 - sparc64 is a 64 bit arch