add dependency rockin->src to allow parallel build

Author: svenschneider

Makefile

@@ -17,6 +17,10 @@ BASEDIR = .
 
 SUBDIRS = src rockin
 
+# Explicit dependencies, this is needed to have make bail out if there is any
+# error. This is also necessary for working parallel builds
+rockin: src
+
 include $(BASEDIR)/etc/buildsys/config.mk
 include $(BUILDSYSDIR)/rules.mk
 include $(BUILDSYSDIR)/root/root.mk