diff --git a/checkin_notes b/checkin_notes
index bb641f54c5..88bc6c41be 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -503,3 +503,12 @@ David  27 Nov 2007
 
     wrapper/
         wrapper.C
+
+Charlie 28 Nov 2007
+    Mac: Add x86_64_Deployment build configuration to XCode project for use 
+        with V6 Clients running under OS 10.5 on 64-bit capable Intel Macs.
+    
+    mac_build/
+        UpperCase2.xcodeproj/
+            project.pbxproj
+
diff --git a/mac_build/UpperCase2.xcodeproj/project.pbxproj b/mac_build/UpperCase2.xcodeproj/project.pbxproj
index 7b73130044..bbd0070d61 100644
--- a/mac_build/UpperCase2.xcodeproj/project.pbxproj
+++ b/mac_build/UpperCase2.xcodeproj/project.pbxproj
@@ -451,9 +451,11 @@
 		08FB7793FE84155DC02AAC07 /* Project object */ = {
 			isa = PBXProject;
 			buildConfigurationList = DD6341040973C81800B1057F /* Build configuration list for PBXProject "UpperCase2" */;
+			compatibilityVersion = "Xcode 2.4";
 			hasScannedForEncodings = 1;
 			mainGroup = 08FB7794FE84155DC02AAC07 /* UpperCase */;
 			projectDirPath = "";
+			projectRoot = "";
 			targets = (
 				DD84C71E0C856D9E000EBEC4 /* Build_All */,
 				8DD76FA90486AB0100D96B5E /* UC2 */,
@@ -548,6 +550,87 @@
 /* End PBXTargetDependency section */
 
 /* Begin XCBuildConfiguration section */
+		DD0E8F180CFD704700973F10 /* x86_64_Deployment */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ARCHS = i386;
+				GCC_VERSION_i386 = 4.0;
+				GCC_VERSION_ppc = 3.3;
+				GCC_VERSION_x86_64 = 4.0;
+				MACOSX_DEPLOYMENT_TARGET = 10.4;
+				MACOSX_DEPLOYMENT_TARGET_i386 = 10.4;
+				MACOSX_DEPLOYMENT_TARGET_ppc = 10.3;
+				MACOSX_DEPLOYMENT_TARGET_x86_64 = 10.5;
+				SDKROOT = /Developer/SDKs/MacOSX10.5.sdk;
+				SDKROOT_i386 = /Developer/SDKs/MacOSX10.4u.sdk;
+				SDKROOT_ppc = /Developer/SDKs/MacOSX10.3.9.sdk;
+				SDKROOT_x86_64 = /Developer/SDKs/MacOSX10.5.sdk;
+			};
+			name = x86_64_Deployment;
+		};
+		DD0E8F190CFD704700973F10 /* x86_64_Deployment */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				PRODUCT_NAME = Build_All;
+			};
+			name = x86_64_Deployment;
+		};
+		DD0E8F1A0CFD704700973F10 /* x86_64_Deployment */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ARCHS = x86_64;
+				COPY_PHASE_STRIP = YES;
+				GCC_ENABLE_FIX_AND_CONTINUE = NO;
+				GCC_GENERATE_DEBUGGING_SYMBOLS = NO;
+				GCC_MODEL_TUNING = G5;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				HEADER_SEARCH_PATHS = "../../boinc/**";
+				INSTALL_PATH = "$(HOME)/bin";
+				LIBRARY_SEARCH_PATHS = ../../boinc/mac_build/build/Deployment/;
+				MACOSX_DEPLOYMENT_TARGET = 10.5;
+				OTHER_CFLAGS = (
+					"-DHAVE_SIGNAL_H",
+					"-D_THREAD_SAFE",
+				);
+				OTHER_LDFLAGS = (
+					"-lboinc_api",
+					"-lboinc",
+				);
+				PREBINDING = NO;
+				PRODUCT_NAME = uc2;
+				ZERO_LINK = NO;
+			};
+			name = x86_64_Deployment;
+		};
+		DD0E8F1B0CFD704700973F10 /* x86_64_Deployment */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				COPY_PHASE_STRIP = YES;
+				GCC_ENABLE_FIX_AND_CONTINUE = NO;
+				GCC_GENERATE_DEBUGGING_SYMBOLS = NO;
+				GCC_MODEL_TUNING = G5;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				HEADER_SEARCH_PATHS = "../../boinc/**";
+				INSTALL_PATH = "$(HOME)/bin";
+				LIBRARY_SEARCH_PATHS = ../../boinc/mac_build/build/Deployment/;
+				MACOSX_DEPLOYMENT_TARGET = 10.4;
+				OTHER_CFLAGS = (
+					"-DHAVE_SIGNAL_H",
+					"-D_THREAD_SAFE",
+				);
+				OTHER_LDFLAGS = (
+					"-lboinc_api",
+					"-lboinc_graphics2",
+					"-lboinc",
+				);
+				PREBINDING = NO;
+				PRODUCT_NAME = uc2_graphics;
+				ZERO_LINK = NO;
+			};
+			name = x86_64_Deployment;
+		};
 		DD6341010973C81800B1057F /* Development */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
@@ -797,6 +880,7 @@
 				DD6341010973C81800B1057F /* Development */,
 				DD6341020973C81800B1057F /* ppc_Deployment */,
 				DD63410B0973C84A00B1057F /* i386_Deployment */,
+				DD0E8F1A0CFD704700973F10 /* x86_64_Deployment */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Development;
@@ -807,6 +891,7 @@
 				DD6341050973C81800B1057F /* Development */,
 				DD6341060973C81800B1057F /* ppc_Deployment */,
 				DD63410C0973C84A00B1057F /* i386_Deployment */,
+				DD0E8F180CFD704700973F10 /* x86_64_Deployment */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Development;
@@ -817,6 +902,7 @@
 				DD84C6E70C856B36000EBEC4 /* Development */,
 				DD84C6E80C856B36000EBEC4 /* ppc_Deployment */,
 				DD84C6E90C856B36000EBEC4 /* i386_Deployment */,
+				DD0E8F1B0CFD704700973F10 /* x86_64_Deployment */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Development;
@@ -827,6 +913,7 @@
 				DD84C7290C856DBB000EBEC4 /* Development */,
 				DD84C72A0C856DBB000EBEC4 /* ppc_Deployment */,
 				DD84C72B0C856DBB000EBEC4 /* i386_Deployment */,
+				DD0E8F190CFD704700973F10 /* x86_64_Deployment */,
 			);
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Development;