diff --git a/GNUmakefile b/GNUmakefile
index cdd457f..a5c05af 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1,20 +1,49 @@
 
+include config.make
+
+STAGING_DIR=staging
+DMG=$(PACKAGE_TARNAME)-$(PACKAGE_VERSION).dmg
+
+# DMG file containing package:
+
+$(DMG) : $(STAGING_DIR)
+	hdiutil create -volname "$(PACKAGE_STRING)" -srcdir $(STAGING_DIR) $@
+
+clean : launcher_clean
+	rm -f $(DMG)
+	rm -rf $(STAGING_DIR)
+
+# Staging dir build for package:
+
+APP_DIR=$(STAGING_DIR)/$(PACKAGE_NAME).app
+
+$(STAGING_DIR): launcher
+	rm -rf $(STAGING_DIR)
+	mkdir $(STAGING_DIR)
+	cp -R app-skeleton "$(APP_DIR)"
+	cp launcher "$(APP_DIR)/Contents/MacOS/"
+	# TODO: copy Doom and setup binaries into app dir
+	# TODO: copy other documentation into staging dir
+
+# Launcher build:
+
 CFLAGS=-Wall
 LDFLAGS=-framework Cocoa
 
-OBJS= AppController.o \
-      Execute.o \
-      IWADController.o \
-      IWADLocation.o \
-      LauncherManager.o \
-      main.o
+LAUNCHER_OBJS= \
+        AppController.o \
+        Execute.o \
+        IWADController.o \
+        IWADLocation.o \
+        LauncherManager.o \
+        main.o
 
-launcher : $(OBJS)
-	$(CC) $(LDFLAGS) $(OBJS) -o $@
+launcher : $(LAUNCHER_OBJS)
+	$(CC) $(LDFLAGS) $(LAUNCHER_OBJS) -o $@
 
 %.o : %.m
 	$(CC) -c $(CFLAGS) $^ -o $@
 
-clean :
-	rm -f $(OBJS) launcher
+launcher_clean :
+	rm -f $(LAUNCHER_OBJS) launcher
 
diff --git a/config.make b/config.make
new file mode 100644
index 0000000..49905c8
--- /dev/null
+++ b/config.make
@@ -0,0 +1,10 @@
+# File included by the main makefile that contains details
+# about the package name.  This will eventuall be generated
+# by configure.
+
+PACKAGE = cocoa-doom
+PACKAGE_NAME = Cocoa Doom
+PACKAGE_STRING = Cocoa Doom 1.2.1
+PACKAGE_TARNAME = cocoa-doom
+PACKAGE_VERSION = 1.2.1
+