diff --git a/.gitignore b/.gitignore
index b90654c..028fedc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,4 +21,5 @@ xcuserdata/
 # End of https://www.toptal.com/developers/gitignore/api/xcode
 
 build/
-build.xcresult/
\ No newline at end of file
+build.xcresult/
+/archive.xcarchive
diff --git a/MacDependency/ArchitectureModel.h b/MacDependency/ArchitectureModel.h
index 3a6c995..7e61ffe 100644
--- a/MacDependency/ArchitectureModel.h
+++ b/MacDependency/ArchitectureModel.h
@@ -8,7 +8,7 @@
 
 #import <Cocoa/Cocoa.h>
 #import "MachOModel.h"
-#include "macho/machoarchitecture.h"
+#include "MachO/machoarchitecture.h"
 #include "MachO/machoheader.h"
 
 @class MyDocument;
diff --git a/MacDependency/MacDependency.xcodeproj/project.pbxproj b/MacDependency/MacDependency.xcodeproj/project.pbxproj
index fb48979..53f187d 100644
--- a/MacDependency/MacDependency.xcodeproj/project.pbxproj
+++ b/MacDependency/MacDependency.xcodeproj/project.pbxproj
@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 53;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -263,7 +263,8 @@
 		2A37F4A9FDCFA73011CA2CEA /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1310;
+				BuildIndependentTargetsInParallel = YES;
+				LastUpgradeCheck = 1430;
 				ORGANIZATIONNAME = "Konrad Windszus";
 			};
 			buildConfigurationList = C05733CB08A9546B00998B17 /* Build configuration list for PBXProject "MacDependency" */;
@@ -399,11 +400,12 @@
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CODE_SIGN_IDENTITY = "-";
 				COPY_PHASE_STRIP = NO;
+				DEAD_CODE_STRIPPING = YES;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_MODEL_TUNING = G5;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				INFOPLIST_FILE = Info.plist;
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.googlecode.${PRODUCT_NAME:identifier}";
 				PRODUCT_NAME = MacDependency;
 				SDKROOT = macosx;
@@ -416,10 +418,11 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CODE_SIGN_IDENTITY = "-";
+				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				GCC_MODEL_TUNING = G5;
 				INFOPLIST_FILE = Info.plist;
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.googlecode.${PRODUCT_NAME:identifier}";
 				PRODUCT_NAME = MacDependency;
 				SDKROOT = macosx;
@@ -430,6 +433,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "c++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
@@ -450,6 +454,7 @@
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				DEAD_CODE_STRIPPING = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = c99;
@@ -478,7 +483,7 @@
 					/opt/local/include,
 					./../,
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.7;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
 			};
@@ -509,6 +514,7 @@
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				DEAD_CODE_STRIPPING = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = c99;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -521,7 +527,7 @@
 					/opt/local/include,
 					./../,
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				SDKROOT = macosx;
 			};
 			name = Release;
diff --git a/MacDependency/MacDependency.xcodeproj/xcshareddata/xcschemes/MacDependency.xcscheme b/MacDependency/MacDependency.xcodeproj/xcshareddata/xcschemes/MacDependency.xcscheme
index d7d53df..77183b4 100644
--- a/MacDependency/MacDependency.xcodeproj/xcshareddata/xcschemes/MacDependency.xcscheme
+++ b/MacDependency/MacDependency.xcodeproj/xcshareddata/xcschemes/MacDependency.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1320"
+   LastUpgradeVersion = "1430"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/MacDependency/MachOModel.mm b/MacDependency/MachOModel.mm
index a341663..7c67bfe 100644
--- a/MacDependency/MachOModel.mm
+++ b/MacDependency/MachOModel.mm
@@ -51,9 +51,8 @@ - (id) initWithFilename:(std::string&)filename command:(DylibCommand*)aCommand d
 			NSString* log = [NSString stringWithFormat:NSLocalizedString(@"ERR_ARCHITECTURE_MISMATCH", nil), filename.c_str(), [parent name]];
 			[aDocument appendLogLine:log withModel:self state:state];
 		}
-
-	}  catch (MachOException& exc) {
-		[self setStateWithWarning:isWeakReference];
+	} catch (MachOException& exc) {
+		[self setStateWithWarning:isWeakReference || exc.isWarning()];
 		NSString* log = [NSString stringWithStdString:exc.getCause()];
 		[aDocument appendLogLine:log withModel:self state:state];
 		// distinguish between weak and strong. In both cases append to tree with a status color
@@ -176,10 +175,10 @@ - (NSColor*) textColor {
 	NSColor* color;
 	switch(state) {
 		case StateWarning:
-			color = [NSColor systemOrangeColor];
+			color = [NSColor systemYellowColor];
 			break;
 		case StateError:
-			color = [NSColor systemOrangeColor];
+			color = [NSColor systemRedColor];
 			break;
 		default:
 			color = [NSColor labelColor];
diff --git a/MachO/MachO.xcodeproj/project.pbxproj b/MachO/MachO.xcodeproj/project.pbxproj
index c087291..2755f9a 100644
--- a/MachO/MachO.xcodeproj/project.pbxproj
+++ b/MachO/MachO.xcodeproj/project.pbxproj
@@ -394,7 +394,7 @@
 				GCC_WARN_NON_VIRTUAL_DESTRUCTOR = YES;
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "@executable_path/../Frameworks";
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				OTHER_LDFLAGS = "-Wl,-search_paths_first";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.googlecode.${PRODUCT_NAME:identifier}";
 				PRODUCT_NAME = MachO;
@@ -417,7 +417,7 @@
 				GCC_PREFIX_HEADER = MachO_Prefix.h;
 				INFOPLIST_FILE = Info.plist;
 				INSTALL_PATH = "@executable_path/../Frameworks";
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				OTHER_LDFLAGS = "-Wl,-search_paths_first";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.googlecode.${PRODUCT_NAME:identifier}";
 				PRODUCT_NAME = MachO;
diff --git a/MachO/MachO.xcodeproj/xcshareddata/xcschemes/MachO.xcscheme b/MachO/MachO.xcodeproj/xcshareddata/xcschemes/MachO.xcscheme
index f2dcc74..596e580 100644
--- a/MachO/MachO.xcodeproj/xcshareddata/xcschemes/MachO.xcscheme
+++ b/MachO/MachO.xcodeproj/xcshareddata/xcschemes/MachO.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1320"
+   LastUpgradeVersion = "1430"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/MachO/internalfile.cpp b/MachO/internalfile.cpp
index c138410..5de50a0 100644
--- a/MachO/internalfile.cpp
+++ b/MachO/internalfile.cpp
@@ -1,6 +1,8 @@
 #include "internalfile.h"
 #include "machoexception.h"
 
+#include <dlfcn.h>
+
 // use reference counting to reuse files for all used architectures
 InternalFile* InternalFile::create(InternalFile* file) {
   file->counter++;
@@ -24,9 +26,13 @@ filename(filename), counter(1)
   // open file handle
   file.open(this->filename, std::ios_base::in | std::ios_base::binary);
   if (file.fail()) {
-    std::ostringstream error;
-    error << "Couldn't open file '" << filename << "'.";
-    throw MachOException(error.str());
+    void* dylib = dlopen(this->filename.c_str(), RTLD_LAZY);
+    if (dylib) {
+      dlclose(dylib);
+      throw MachOException("System cached library '" + filename + "'.", true);
+    } else {
+      throw MachOException("Couldn't open file '" + filename + "'.");
+    }
   }
   
   struct stat buffer;
diff --git a/MachO/machoexception.cpp b/MachO/machoexception.cpp
index 66ba42c..8496298 100644
--- a/MachO/machoexception.cpp
+++ b/MachO/machoexception.cpp
@@ -1,6 +1,9 @@
 #include "machoexception.h"
 
-MachOException::MachOException(const std::string& cause) : cause(cause)
+MachOException::MachOException(const std::string& cause) : cause(cause), warning(false)
 {
 }
 
+MachOException::MachOException(const std::string& cause, bool warning) : cause(cause), warning(warning)
+{
+}
diff --git a/MachO/machoexception.h b/MachO/machoexception.h
index a6b3c08..e6580bb 100644
--- a/MachO/machoexception.h
+++ b/MachO/machoexception.h
@@ -7,9 +7,12 @@ class EXPORT MachOException
 {
 public:
   MachOException(const std::string&);
+  MachOException(const std::string&, bool warning);
   const std::string& getCause() { return cause; }
+  const bool isWarning() { return warning; }
 private:
   const std::string cause;
+  bool warning;
 };
 
 #endif // MACHOEXCEPTION_H