Index: ObjFW.xcodeproj/project.pbxproj
==================================================================
--- ObjFW.xcodeproj/project.pbxproj
+++ ObjFW.xcodeproj/project.pbxproj
@@ -1780,11 +1780,11 @@
 
 /* Begin PBXProject section */
 		08FB7793FE84155DC02AAC07 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0500;
+				LastUpgradeCheck = 0510;
 			};
 			buildConfigurationList = 1DEB919308733D9F0010E9CD /* Build configuration list for PBXProject "ObjFW" */;
 			compatibilityVersion = "Xcode 3.1";
 			developmentRegion = English;
 			hasScannedForEncodings = 1;
@@ -2114,11 +2114,11 @@
 
 /* Begin XCBuildConfiguration section */
 		1DEB919408733D9F0010E9CD /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_C_LANGUAGE_STANDARD = c11;
 				GCC_OPTIMIZATION_LEVEL = 2;
 				OTHER_CFLAGS = (
 					"-fexceptions",
 					"-fconstant-string-class=OFConstantString",
 					"-fno-constant-cfstrings",
@@ -2131,19 +2131,18 @@
 					"-Werror",
 					"-Wshorten-64-to-32",
 					"-Wwrite-strings",
 					"-Wcast-align",
 					"-Wpointer-arith",
-					"-Wno-objc-root-class",
 				);
 			};
 			name = Debug;
 		};
 		1DEB919508733D9F0010E9CD /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_C_LANGUAGE_STANDARD = c11;
 				GCC_OPTIMIZATION_LEVEL = 2;
 				OTHER_CFLAGS = (
 					"-fexceptions",
 					"-fconstant-string-class=OFConstantString",
 					"-fno-constant-cfstrings",
@@ -2156,11 +2155,10 @@
 					"-Werror",
 					"-Wshorten-64-to-32",
 					"-Wwrite-strings",
 					"-Wcast-align",
 					"-Wpointer-arith",
-					"-Wno-objc-root-class",
 				);
 			};
 			name = Release;
 		};
 		4B187E20163EA29F0049A832 /* Debug */ = {