diff --git a/xcode/expat/expat.xcodeproj/project.pbxproj b/xcode/expat/expat.xcodeproj/project.pbxproj
index a20bec7f82..efeb28d07a 100644
--- a/xcode/expat/expat.xcodeproj/project.pbxproj
+++ b/xcode/expat/expat.xcodeproj/project.pbxproj
@@ -152,6 +152,7 @@
 					"$(inherited)",
 					HAVE_MEMMOVE,
 				);
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -163,6 +164,7 @@
 					"$(inherited)",
 					HAVE_MEMMOVE,
 				);
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};
diff --git a/xcode/freetype/freetype.xcodeproj/project.pbxproj b/xcode/freetype/freetype.xcodeproj/project.pbxproj
index f315f55e4b..403b5a6443 100644
--- a/xcode/freetype/freetype.xcodeproj/project.pbxproj
+++ b/xcode/freetype/freetype.xcodeproj/project.pbxproj
@@ -1929,6 +1929,7 @@
 			baseConfigurationReference = 34F558661DBF474D00A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
 				FT2_BUILD_LIBRARY = 1;
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/freetype/include",
@@ -1942,6 +1943,7 @@
 			baseConfigurationReference = 34F558671DBF474D00A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
 				FT2_BUILD_LIBRARY = 1;
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/freetype/include",
diff --git a/xcode/fribidi/fribidi.xcodeproj/project.pbxproj b/xcode/fribidi/fribidi.xcodeproj/project.pbxproj
index 31cb670bbe..f2b0cfdf69 100644
--- a/xcode/fribidi/fribidi.xcodeproj/project.pbxproj
+++ b/xcode/fribidi/fribidi.xcodeproj/project.pbxproj
@@ -274,6 +274,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5585C1DBF3EFF00A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/fribidi",
@@ -286,6 +287,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5585D1DBF3EFF00A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/fribidi",
diff --git a/xcode/gflags/gflags.xcodeproj/project.pbxproj b/xcode/gflags/gflags.xcodeproj/project.pbxproj
index d4c1232994..5270698473 100644
--- a/xcode/gflags/gflags.xcodeproj/project.pbxproj
+++ b/xcode/gflags/gflags.xcodeproj/project.pbxproj
@@ -144,6 +144,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558601DBF434600A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/gflags/src",
@@ -155,6 +156,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558611DBF434600A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/gflags/src",
diff --git a/xcode/jansson/jansson.xcodeproj/project.pbxproj b/xcode/jansson/jansson.xcodeproj/project.pbxproj
index 1c9b74c1a9..9e4bc36bc4 100644
--- a/xcode/jansson/jansson.xcodeproj/project.pbxproj
+++ b/xcode/jansson/jansson.xcodeproj/project.pbxproj
@@ -216,6 +216,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558681DBF483000A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/jansson/src",
@@ -227,6 +228,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558691DBF483000A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/jansson/src",
diff --git a/xcode/minizip/minizip.xcodeproj/project.pbxproj b/xcode/minizip/minizip.xcodeproj/project.pbxproj
index 18bf77913c..f0dd7ebef3 100644
--- a/xcode/minizip/minizip.xcodeproj/project.pbxproj
+++ b/xcode/minizip/minizip.xcodeproj/project.pbxproj
@@ -172,6 +172,7 @@
 					"$(inherited)",
 					"NOCRYPT=1",
 				);
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -183,6 +184,7 @@
 					"$(inherited)",
 					"NOCRYPT=1",
 				);
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};
diff --git a/xcode/oauthcpp/oauthcpp.xcodeproj/project.pbxproj b/xcode/oauthcpp/oauthcpp.xcodeproj/project.pbxproj
index 84ae7d79f8..93e7ee3fce 100644
--- a/xcode/oauthcpp/oauthcpp.xcodeproj/project.pbxproj
+++ b/xcode/oauthcpp/oauthcpp.xcodeproj/project.pbxproj
@@ -168,6 +168,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558701DBF4AB300A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/liboauthcpp/include",
@@ -179,6 +180,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558711DBF4AB300A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/liboauthcpp/include",
diff --git a/xcode/protobuf/protobuf.xcodeproj/project.pbxproj b/xcode/protobuf/protobuf.xcodeproj/project.pbxproj
index 3fb865fe1b..980a44d14f 100644
--- a/xcode/protobuf/protobuf.xcodeproj/project.pbxproj
+++ b/xcode/protobuf/protobuf.xcodeproj/project.pbxproj
@@ -168,6 +168,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558581DBF3D2E00A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/protobuf/src",
@@ -180,6 +181,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F558591DBF3D2E00A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)/3party/protobuf/src",
diff --git a/xcode/sdf_image/sdf_image.xcodeproj/project.pbxproj b/xcode/sdf_image/sdf_image.xcodeproj/project.pbxproj
index ba79491171..48046a5bd9 100644
--- a/xcode/sdf_image/sdf_image.xcodeproj/project.pbxproj
+++ b/xcode/sdf_image/sdf_image.xcodeproj/project.pbxproj
@@ -136,6 +136,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5586A1DBF48E500A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -143,6 +144,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5586B1DBF48E500A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};
diff --git a/xcode/stb_image/stb_image.xcodeproj/project.pbxproj b/xcode/stb_image/stb_image.xcodeproj/project.pbxproj
index decf609182..20bc4b7244 100644
--- a/xcode/stb_image/stb_image.xcodeproj/project.pbxproj
+++ b/xcode/stb_image/stb_image.xcodeproj/project.pbxproj
@@ -136,6 +136,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34EBB47E1DBF52D3005BE9B8 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Debug;
 		};
@@ -143,6 +144,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34EBB47F1DBF52D3005BE9B8 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 			};
 			name = Release;
 		};
diff --git a/xcode/tess2/tess2.xcodeproj/project.pbxproj b/xcode/tess2/tess2.xcodeproj/project.pbxproj
index 7124624271..891abff185 100644
--- a/xcode/tess2/tess2.xcodeproj/project.pbxproj
+++ b/xcode/tess2/tess2.xcodeproj/project.pbxproj
@@ -184,6 +184,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5585A1DBF3DC500A4FC11 /* common-debug.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)",
@@ -197,6 +198,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34F5585B1DBF3DC500A4FC11 /* common-release.xcconfig */;
 			buildSettings = {
+				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(OMIM_ROOT)",