Index: configure.ac
===================================================================
--- configure.ac	(revision 1405031)
+++ configure.ac	(working copy)
@@ -1393,6 +1393,10 @@
 AC_DEFINE_UNQUOTED([SVN_BUILD_HOST], "${host}",
                    [Defined to the config.guess name of the build system])
 
+dnl Provide ${target} for use in compiled code (for user-agent string)
+AC_DEFINE_UNQUOTED([SVN_BUILD_TARGET], "${target}",
+                   [Defined to the config.guess name of the build target])
+
 AC_OUTPUT
 
 # ==== Print final messages to user ==========================================
Index: subversion/libsvn_ra_serf/ra_serf.h
===================================================================
--- subversion/libsvn_ra_serf/ra_serf.h	(revision 1405031)
+++ subversion/libsvn_ra_serf/ra_serf.h	(working copy)
@@ -56,8 +56,9 @@
 /** Use this to silence compiler warnings about unused parameters. */
 #define UNUSED_CTX(x) ((void)(x))
 
-/** Our User-Agent string. */
-#define USER_AGENT "SVN/" SVN_VER_NUMBER " serf/" \
+    /** Our User-Agent string. */
+#define USER_AGENT "SVN/" SVN_VER_NUMBER " (" SVN_BUILD_TARGET ")" \
+                   " serf/" \
                    APR_STRINGIFY(SERF_MAJOR_VERSION) "." \
                    APR_STRINGIFY(SERF_MINOR_VERSION) "." \
                    APR_STRINGIFY(SERF_PATCH_VERSION)
Index: subversion/libsvn_ra_svn/ra_svn.h
===================================================================
--- subversion/libsvn_ra_svn/ra_svn.h	(revision 1405031)
+++ subversion/libsvn_ra_svn/ra_svn.h	(working copy)
@@ -57,7 +57,8 @@
                                                void *baton);
 
 /* The default "user agent". */
-#define SVN_RA_SVN__DEFAULT_USERAGENT  "SVN/" SVN_VER_NUMBER
+#define SVN_RA_SVN__DEFAULT_USERAGENT  "SVN/" SVN_VER_NUMBER\
+                                       " (" SVN_BUILD_TARGET ")"
 
 /* The size of our per-connection read and write buffers. */
 #define SVN_RA_SVN__PAGE_SIZE 4096
Index: subversion/svn_private_config.hw
===================================================================
--- subversion/svn_private_config.hw	(revision 1405034)
+++ subversion/svn_private_config.hw	(working copy)
@@ -33,6 +33,12 @@
 /* Define to a Windows-specific equivalent of config.guess output */
 #define SVN_BUILD_HOST "x86-microsoft-windows"
 
+#ifdef _WIN64
+#define SVN_BUILD_TARGET "x86-microsoft-windows"
+#else
+#define SVN_BUILD_TARGET "x64-microsoft-windows"
+#endif
+
 /* The minimal version of Berkeley DB we want */
 #define SVN_FS_WANT_DB_MAJOR    4
 #define SVN_FS_WANT_DB_MINOR    0