diff --git a/share/mk/local.autodep.mk b/share/mk/local.autodep.mk
--- a/share/mk/local.autodep.mk
+++ b/share/mk/local.autodep.mk
@@ -27,3 +27,5 @@
 
 .cc.cpp-out: .NOMETA
 	@${CXX} -E ${CXXFLAGS} ${.IMPSRC} | grep -v '^[[:space:]]*$$'
+
+.-include <site.autodep.mk>
diff --git a/share/mk/local.gendirdeps.mk b/share/mk/local.gendirdeps.mk
--- a/share/mk/local.gendirdeps.mk
+++ b/share/mk/local.gendirdeps.mk
@@ -70,3 +70,5 @@
 
 # avoid churn for now
 LOCAL_DEPENDS_GUARD= _{DEP_RELDIR} == _{_DEP_RELDIR}
+
+.-include <site.gendirdeps.mk>