diff --git a/heimdall-frontend/heimdall-frontend.pro b/heimdall-frontend/heimdall-frontend.pro
index 84093cc..cd2bb01 100644
--- a/heimdall-frontend/heimdall-frontend.pro
+++ b/heimdall-frontend/heimdall-frontend.pro
@@ -6,15 +6,44 @@ TEMPLATE = app
 TARGET = heimdall-frontend
 
 macx {
-	PRIVATE_FRAMEWORKS.files = /Library/Frameworks/QtCore.framework \
-		/Library/Frameworks/QtGui.framework /Library/Frameworks/QtXml.framework
+	message("")
+
+	QT_FRAMEWORKS_DIR = $$(QT_FRAMEWORKS_DIR)
+	isEmpty(QT_FRAMEWORKS_DIR) {
+		message("QT_FRAMEWORKS_DIR not specified, using default:")
+		QT_FRAMEWORKS_DIR = /System/Library/Frameworks
+	}
+
+	message("QT_FRAMEWORKS_DIR = $$QT_FRAMEWORKS_DIR")
+	message("")
+
+	QMAKE_MACOSX_DEPLOYMENT_TARGET = $$(QMAKE_MACOSX_DEPLOYMENT_TARGET)
+	isEmpty(QMAKE_MACOSX_DEPLOYMENT_TARGET) {
+		message("QMAKE_MACOSX_DEPLOYMENT_TARGET not specified, using default:")
+		QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.4
+	}
+
+	message("QMAKE_MACOSX_DEPLOYMENT_TARGET = $$QMAKE_MACOSX_DEPLOYMENT_TARGET")
+	message("")
+
+	QMAKE_MAC_SDK = $$(QMAKE_MAC_SDK)
+	isEmpty(QMAKE_MAC_SDK) {
+		message("QMAKE_MAC_SDK not specified, using default:")
+		QMAKE_MAC_SDK = /Developer/SDKs/MacOSX10.4.sdk
+	}
+
+	message("QMAKE_MAC_SDK = $$QMAKE_MAC_SDK")
+	message("")
+
+	QMAKE_MACOSX_DEPLOYMENT_TARGET = $$MACOSX_DEPLOYMENT_TARGET
+	QMAKE_MAC_SDK = $$MAC_SDK
+
+	PRIVATE_FRAMEWORKS.files = $$(QTFRAMEWORKSDIR)/QtCore.framework \
+		$$(QTFRAMEWORKSDIR)//QtGui.framework $$(QTFRAMEWORKSDIR)/QtXml.framework
 	PRIVATE_FRAMEWORKS.path = Contents/Frameworks
 
 	QMAKE_BUNDLE_DATA += PRIVATE_FRAMEWORKS
 
-	QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.4
-	QMAKE_MAC_SDK=/Developer/SDKs/MacOSX10.4u.sdk
-
 	config += x86 x86_64 ppc
 
 	isEmpty(OUTPUTDIR) {
diff --git a/heimdall/source/Arguments.h b/heimdall/source/Arguments.h
index 55c196e..17f31fa 100644
--- a/heimdall/source/Arguments.h
+++ b/heimdall/source/Arguments.h
@@ -133,7 +133,7 @@ namespace Heimdall
 		public:
 
 			Arguments(const map<string, ArgumentType>& argumentTypes, const map<string, string>& shortArgumentAliases = (map<string, string>()),
-				const map<string, string> argumentAliases = (map<string, string>()));
+				const map<string, string>& argumentAliases = (map<string, string>()));
 			
 			~Arguments();