diff --git a/AppKit/AppKit.xcodeproj/project.pbxproj b/AppKit/AppKit.xcodeproj/project.pbxproj
index b06e0cbd04..20ef7af246 100644
--- a/AppKit/AppKit.xcodeproj/project.pbxproj
+++ b/AppKit/AppKit.xcodeproj/project.pbxproj
@@ -11429,8 +11429,6 @@
 		6E2B57760976075500DA0954 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				COPY_PHASE_STRIP = YES;
-				SDKROOT = "";
 			};
 			name = Release;
 		};
@@ -11484,7 +11482,6 @@
 		7E891F4E0D4967B6008150D3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				COPY_PHASE_STRIP = YES;
 			};
 			name = Debug;
 		};
diff --git a/ApplicationServices/ApplicationServices.xcodeproj/project.pbxproj b/ApplicationServices/ApplicationServices.xcodeproj/project.pbxproj
index c4959f0223..40999093ad 100644
--- a/ApplicationServices/ApplicationServices.xcodeproj/project.pbxproj
+++ b/ApplicationServices/ApplicationServices.xcodeproj/project.pbxproj
@@ -790,10 +790,6 @@
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = "";
 			};
 			name = Release;
 		};
@@ -891,10 +887,6 @@
 		FEDE64AA118A725B009C3494 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = "";
 			};
 			name = Debug;
 		};
diff --git a/CFNetwork/CFNetwork.xcodeproj/project.pbxproj b/CFNetwork/CFNetwork.xcodeproj/project.pbxproj
index 90142f7db1..79f42c4378 100644
--- a/CFNetwork/CFNetwork.xcodeproj/project.pbxproj
+++ b/CFNetwork/CFNetwork.xcodeproj/project.pbxproj
@@ -368,26 +368,12 @@
 		1DEB91B208733DA50010E9CD /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				ONLY_ACTIVE_ARCH = YES;
-				PREBINDING = NO;
-				SDKROOT = macosx10.6;
 			};
 			name = Debug;
 		};
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = macosx10.6;
 			};
 			name = Release;
 		};
diff --git a/CoreFoundation/CoreFoundation.xcodeproj/project.pbxproj b/CoreFoundation/CoreFoundation.xcodeproj/project.pbxproj
index 48fb8d21d4..2fa97a9cae 100644
--- a/CoreFoundation/CoreFoundation.xcodeproj/project.pbxproj
+++ b/CoreFoundation/CoreFoundation.xcodeproj/project.pbxproj
@@ -1124,28 +1124,12 @@
 		1DEB91B208733DA50010E9CD /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
-				ARCHS = "$(ONLY_ACTIVE_ARCH_PRE_XCODE_3_1)";
-				DSTROOT = /;
-				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				ONLY_ACTIVE_ARCH_PRE_XCODE_3_1 = "$(NATIVE_ARCH)";
-				PREBINDING = NO;
-				SDKROOT = /Developer/SDKs/MacOSX10.5.sdk;
 			};
 			name = Debug;
 		};
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
-				ARCHS = "$(ARCHS_STANDARD_32_BIT_PRE_XCODE_3_1)";
-				ARCHS_STANDARD_32_BIT_PRE_XCODE_3_1 = "ppc i386";
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = /Developer/SDKs/MacOSX10.5.sdk;
 			};
 			name = Release;
 		};
diff --git a/CoreServices/CoreServices.xcodeproj/project.pbxproj b/CoreServices/CoreServices.xcodeproj/project.pbxproj
index 28ecfcf679..7789312b61 100644
--- a/CoreServices/CoreServices.xcodeproj/project.pbxproj
+++ b/CoreServices/CoreServices.xcodeproj/project.pbxproj
@@ -574,26 +574,12 @@
 		1DEB91B208733DA50010E9CD /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				ONLY_ACTIVE_ARCH = YES;
-				PREBINDING = NO;
-				SDKROOT = macosx10.6;
 			};
 			name = Debug;
 		};
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = macosx10.6;
 			};
 			name = Release;
 		};
diff --git a/IOKit/IOKit.xcodeproj/project.pbxproj b/IOKit/IOKit.xcodeproj/project.pbxproj
index 6c07c84274..5a4def7a80 100644
--- a/IOKit/IOKit.xcodeproj/project.pbxproj
+++ b/IOKit/IOKit.xcodeproj/project.pbxproj
@@ -291,6 +291,10 @@
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
+				OTHER_CFLAGS = (
+					"-DIOKIT_INSIDE_BUILD=1",
+					"-D__LITTLE_ENDIAN__",
+				);
 				OTHER_LDFLAGS = (
 					"-shared",
 					"-liphlpapi",
diff --git a/ImageKit/ImageKit.xcodeproj/project.pbxproj b/ImageKit/ImageKit.xcodeproj/project.pbxproj
index 2647ebbd1d..c6007808d7 100644
--- a/ImageKit/ImageKit.xcodeproj/project.pbxproj
+++ b/ImageKit/ImageKit.xcodeproj/project.pbxproj
@@ -268,6 +268,10 @@
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
+				OTHER_CFLAGS = (
+					"-DIMAGEKIT_INSIDE_BUILD=1",
+					"-D__LITTLE_ENDIAN__",
+				);
 				OTHER_LDFLAGS = (
 					"-shared",
 					"-Wl,--enable-auto-import",
@@ -282,7 +286,6 @@
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				OTHER_CFLAGS = "-DIMAGEKIT_INSIDE_BUILD=1";
 			};
 			name = Release;
 		};
diff --git a/NSSpellEngine_hunspell/NSSpellEngine_hunspell.xcodeproj/project.pbxproj b/NSSpellEngine_hunspell/NSSpellEngine_hunspell.xcodeproj/project.pbxproj
index fe4bee5499..ff68d5543c 100644
--- a/NSSpellEngine_hunspell/NSSpellEngine_hunspell.xcodeproj/project.pbxproj
+++ b/NSSpellEngine_hunspell/NSSpellEngine_hunspell.xcodeproj/project.pbxproj
@@ -299,26 +299,12 @@
 		1DEB913F08733D840010E9CD /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				ONLY_ACTIVE_ARCH = YES;
-				PREBINDING = NO;
-				SDKROOT = macosx10.6;
 			};
 			name = Debug;
 		};
 		1DEB914008733D840010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = macosx10.6;
 			};
 			name = Release;
 		};
diff --git a/O2Context_AntiGrain/O2Context_AntiGrain.xcodeproj/project.pbxproj b/O2Context_AntiGrain/O2Context_AntiGrain.xcodeproj/project.pbxproj
index 476b726c92..3f75524f90 100644
--- a/O2Context_AntiGrain/O2Context_AntiGrain.xcodeproj/project.pbxproj
+++ b/O2Context_AntiGrain/O2Context_AntiGrain.xcodeproj/project.pbxproj
@@ -372,7 +372,6 @@
 					"-Wl,--enable-auto-import",
 				);
 				PRODUCT_NAME = O2Context_AntiGrain;
-				SDKROOT = "";
 				WRAPPER_EXTENSION = cgContext;
 			};
 			name = Debug;
@@ -401,7 +400,6 @@
 					"-Wl,--enable-auto-import",
 				);
 				PRODUCT_NAME = O2Context_AntiGrain;
-				SDKROOT = "";
 				WRAPPER_EXTENSION = cgContext;
 			};
 			name = Release;
diff --git a/OpenGL/OpenGL.xcodeproj/project.pbxproj b/OpenGL/OpenGL.xcodeproj/project.pbxproj
index 9eb4832eae..94183e6e17 100644
--- a/OpenGL/OpenGL.xcodeproj/project.pbxproj
+++ b/OpenGL/OpenGL.xcodeproj/project.pbxproj
@@ -420,10 +420,6 @@
 		1DEB91B208733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = "";
 			};
 			name = Release;
 		};
diff --git a/PDFKit/PDFKit.xcodeproj/project.pbxproj b/PDFKit/PDFKit.xcodeproj/project.pbxproj
index 84e3c895d9..89bb78a34e 100644
--- a/PDFKit/PDFKit.xcodeproj/project.pbxproj
+++ b/PDFKit/PDFKit.xcodeproj/project.pbxproj
@@ -330,7 +330,6 @@
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				OTHER_CFLAGS = "-DPDFKIT_INSIDE_BUILD=1";
 			};
 			name = Release;
 		};
diff --git a/Security/Security.xcodeproj/project.pbxproj b/Security/Security.xcodeproj/project.pbxproj
index 6150d02fd4..0586667d17 100644
--- a/Security/Security.xcodeproj/project.pbxproj
+++ b/Security/Security.xcodeproj/project.pbxproj
@@ -499,24 +499,12 @@
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = i386;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = "";
 			};
 			name = Release;
 		};
 		FE081DC1118A1B590026A20E /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = i386;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
-				PREBINDING = NO;
-				SDKROOT = "";
 			};
 			name = Debug;
 		};
diff --git a/objc/objc.xcodeproj/project.pbxproj b/objc/objc.xcodeproj/project.pbxproj
index 70628575b1..d02bb9834a 100644
--- a/objc/objc.xcodeproj/project.pbxproj
+++ b/objc/objc.xcodeproj/project.pbxproj
@@ -1096,8 +1096,6 @@
 		1DEB91B308733DA50010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = i386;
-				PREBINDING = NO;
 			};
 			name = Release;
 		};
@@ -1269,10 +1267,6 @@
 		7E891EBC0D4961EA008150D3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = i386;
-				COPY_PHASE_STRIP = NO;
-				PREBINDING = NO;
-				STRIP_INSTALLED_PRODUCT = NO;
 			};
 			name = Debug;
 		};
diff --git a/xcconfig/platform.xcconfig b/xcconfig/platform.xcconfig
index ec053f7267..0450538f00 100644
--- a/xcconfig/platform.xcconfig
+++ b/xcconfig/platform.xcconfig
@@ -3,3 +3,5 @@ OBJROOT = build
 
 CONFIGURATION_BUILD_DIR = $(BUILD_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)/$(CURRENT_ARCH)
 CONFIGURATION_TEMP_DIR = $(PROJECT_TEMP_DIR)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)/$(CURRENT_ARCH)
+
+GCC_C_LANGUAGE_STANDARD = gnu99