diff --git a/cpp/ios.xcodeproj/project.pbxproj b/cpp/ios.xcodeproj/project.pbxproj
index d7ce8fa2a..cc50fc7e8 100644
--- a/cpp/ios.xcodeproj/project.pbxproj
+++ b/cpp/ios.xcodeproj/project.pbxproj
@@ -353,9 +353,11 @@
 				GCC_C_LANGUAGE_STANDARD = c99;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
+				GCC_VERSION = com.apple.compilers.llvmgcc42;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = core/src;
+				IPHONEOS_DEPLOYMENT_TARGET = 4.0;
 				OTHER_LDFLAGS = "-ObjC";
 				SDKROOT = iphoneos;
 				WARNING_CFLAGS = (
@@ -377,9 +379,11 @@
 				);
 				GCC_C_LANGUAGE_STANDARD = c99;
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
+				GCC_VERSION = com.apple.compilers.llvmgcc42;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = core/src;
+				IPHONEOS_DEPLOYMENT_TARGET = 4.0;
 				OTHER_LDFLAGS = "-ObjC";
 				SDKROOT = iphoneos;
 				WARNING_CFLAGS = (
diff --git a/objc/ios.xcodeproj/project.pbxproj b/objc/ios.xcodeproj/project.pbxproj
index fc573e111..8b7ef58b4 100644
--- a/objc/ios.xcodeproj/project.pbxproj
+++ b/objc/ios.xcodeproj/project.pbxproj
@@ -236,12 +236,14 @@
 				);
 				GCC_C_LANGUAGE_STANDARD = c99;
 				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_VERSION = com.apple.compilers.llvmgcc42;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = (
 					../cpp/core/src,
 					src,
 				);
+				IPHONEOS_DEPLOYMENT_TARGET = 4.0;
 				OTHER_LDFLAGS = "-ObjC";
 				SDKROOT = iphoneos;
 				WARNING_CFLAGS = (
@@ -262,12 +264,14 @@
 					armv7,
 				);
 				GCC_C_LANGUAGE_STANDARD = c99;
+				GCC_VERSION = com.apple.compilers.llvmgcc42;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = (
 					../cpp/core/src,
 					src,
 				);
+				IPHONEOS_DEPLOYMENT_TARGET = 4.0;
 				OTHER_LDFLAGS = "-ObjC";
 				SDKROOT = iphoneos;
 				WARNING_CFLAGS = (
diff --git a/objc/src/ZXing/ZXCapture.h b/objc/src/ZXing/ZXCapture.h
index 33c0f0227..6bababad9 100644
--- a/objc/src/ZXing/ZXCapture.h
+++ b/objc/src/ZXing/ZXCapture.h
@@ -108,11 +108,11 @@ ZX(<CAAction ZXAVC(AVCaptureVideoDataOutputSampleBufferDelegate)>) {
 @property (nonatomic) CGAffineTransform transform;
 @property (nonatomic, readonly) void* output;
 @property (nonatomic, readonly) CALayer* layer;
-@property (nonatomic, readonly) CALayer* luminance;
-@property (nonatomic, readonly) CALayer* binary;
 
 - (id)init;
+- (CALayer*)luminance;
 - (void)setLuminance:(BOOL)on_off;
+- (CALayer*)binary;
 - (void)setBinary:(BOOL)on_off;
 - (void)start;
 - (void)stop;