diff --git a/xcode/jansson/jansson.xcodeproj/project.pbxproj b/xcode/jansson/jansson.xcodeproj/project.pbxproj
index c392af83cc..1c9b74c1a9 100644
--- a/xcode/jansson/jansson.xcodeproj/project.pbxproj
+++ b/xcode/jansson/jansson.xcodeproj/project.pbxproj
@@ -31,7 +31,8 @@
 
 /* Begin PBXFileReference section */
 		345C55F71C93143B00B6783F /* myjansson.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = myjansson.cpp; sourceTree = "<group>"; };
-		670D05B01B0E09E40013A7AC /* defaults.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = defaults.xcconfig; path = ../defaults.xcconfig; sourceTree = "<group>"; };
+		34F558681DBF483000A4FC11 /* common-debug.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = "common-debug.xcconfig"; path = "../common-debug.xcconfig"; sourceTree = "<group>"; };
+		34F558691DBF483000A4FC11 /* common-release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = "common-release.xcconfig"; path = "../common-release.xcconfig"; sourceTree = "<group>"; };
 		6753444D1A3F664300A0A8C3 /* libjansson.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libjansson.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		6753445B1A3F666300A0A8C3 /* jansson_handle.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = jansson_handle.cpp; sourceTree = "<group>"; };
 		6753445C1A3F666300A0A8C3 /* jansson_handle.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = jansson_handle.hpp; sourceTree = "<group>"; };
@@ -91,7 +92,8 @@
 		675344441A3F664300A0A8C3 = {
 			isa = PBXGroup;
 			children = (
-				670D05B01B0E09E40013A7AC /* defaults.xcconfig */,
+				34F558681DBF483000A4FC11 /* common-debug.xcconfig */,
+				34F558691DBF483000A4FC11 /* common-release.xcconfig */,
 				6753444F1A3F664300A0A8C3 /* jansson */,
 				6753444E1A3F664300A0A8C3 /* Products */,
 			);
@@ -212,102 +214,30 @@
 /* Begin XCBuildConfiguration section */
 		675344561A3F664300A0A8C3 /* Debug */ = {
 			isa = XCBuildConfiguration;
-			baseConfigurationReference = 670D05B01B0E09E40013A7AC /* defaults.xcconfig */;
+			baseConfigurationReference = 34F558681DBF483000A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
-				CLANG_ENABLE_MODULES = YES;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				CLANG_WARN_BOOL_CONVERSION = YES;
-				CLANG_WARN_CONSTANT_CONVERSION = YES;
-				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
-				CLANG_WARN_EMPTY_BODY = YES;
-				CLANG_WARN_ENUM_CONVERSION = YES;
-				CLANG_WARN_INT_CONVERSION = YES;
-				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
-				CLANG_WARN_UNREACHABLE_CODE = YES;
-				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				COPY_PHASE_STRIP = NO;
-				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				ENABLE_TESTABILITY = YES;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_DYNAMIC_NO_PIC = NO;
-				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_PREPROCESSOR_DEFINITIONS = (
-					"DEBUG=1",
-					"$(inherited)",
-				);
-				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
-				GCC_WARN_UNDECLARED_SELECTOR = YES;
-				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				GCC_WARN_UNUSED_FUNCTION = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/jansson/src",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
-				MTL_ENABLE_DEBUG_INFO = YES;
-				ONLY_ACTIVE_ARCH = YES;
-				SDKROOT = macosx;
-				SUPPORTED_PLATFORMS = "macosx iphonesimulator iphoneos";
-				WARNING_CFLAGS = "-w";
 			};
 			name = Debug;
 		};
 		675344571A3F664300A0A8C3 /* Release */ = {
 			isa = XCBuildConfiguration;
-			baseConfigurationReference = 670D05B01B0E09E40013A7AC /* defaults.xcconfig */;
+			baseConfigurationReference = 34F558691DBF483000A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
-				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
-				CLANG_CXX_LIBRARY = "libc++";
-				CLANG_ENABLE_MODULES = YES;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				CLANG_WARN_BOOL_CONVERSION = YES;
-				CLANG_WARN_CONSTANT_CONVERSION = YES;
-				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
-				CLANG_WARN_EMPTY_BODY = YES;
-				CLANG_WARN_ENUM_CONVERSION = YES;
-				CLANG_WARN_INT_CONVERSION = YES;
-				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
-				CLANG_WARN_UNREACHABLE_CODE = YES;
-				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				COPY_PHASE_STRIP = YES;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
-				ENABLE_NS_ASSERTIONS = NO;
-				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				GCC_C_LANGUAGE_STANDARD = gnu99;
-				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
-				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
-				GCC_WARN_UNDECLARED_SELECTOR = YES;
-				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
-				GCC_WARN_UNUSED_FUNCTION = YES;
-				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/jansson/src",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
-				MTL_ENABLE_DEBUG_INFO = NO;
-				SDKROOT = macosx;
-				SUPPORTED_PLATFORMS = "macosx iphonesimulator iphoneos";
-				WARNING_CFLAGS = "-w";
 			};
 			name = Release;
 		};
 		675344591A3F664300A0A8C3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				COMBINE_HIDPI_IMAGES = YES;
 				EXECUTABLE_PREFIX = lib;
-				GCC_ENABLE_CPP_EXCEPTIONS = YES;
-				GCC_ENABLE_CPP_RTTI = YES;
-				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
-				HEADER_SEARCH_PATHS = "$(inherited)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -315,12 +245,7 @@
 		6753445A1A3F664300A0A8C3 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				COMBINE_HIDPI_IMAGES = YES;
 				EXECUTABLE_PREFIX = lib;
-				GCC_ENABLE_CPP_EXCEPTIONS = YES;
-				GCC_ENABLE_CPP_RTTI = YES;
-				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
-				HEADER_SEARCH_PATHS = "$(inherited)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;