diff --git a/Makefile.builder b/Makefile.builder
new file mode 100644
index 00000000..470aaa64
--- /dev/null
+++ b/Makefile.builder
@@ -0,0 +1,3 @@
+ifeq ($(PACKAGE_SET),dom0)
+RPM_SPEC_FILES := $(addprefix rpm_spec/,core-dom0-doc.spec core-dom0.spec)
+endif