Fix issues in the Makefile.

src/Makefile

@@ -21,6 +21,8 @@ LIBS =
 
 FRAMEWORKS = -framework AppKit -framework ServiceManagement
 
+default: $(EXEC).app
+
 # HACK: Target is getting touched because timestamps of the generated
 # 	    object file don't change unless there's an actual change in the
 #       outputted object code. This results in this target running every
@@ -89,8 +91,6 @@ $(EXEC).app: $(EXEC)
 			codesign -s ${APPLE_DEVELOPER_ID_APPLICATION} -f --timestamp \
 				-o runtime $(EXEC).app)
 
-all: $(EXEC).app
-
 clean:
 	rm -rf $(EXEC) $(EXEC).app arm64 x86_64
 	mkdir arm64 x86_64