diff --git a/runtime/Makefile b/runtime/Makefile
index 2fad2286f87..48ea8ea93cb 100644
--- a/runtime/Makefile
+++ b/runtime/Makefile
@@ -1,5 +1,7 @@
 # Libraries Makefile:  Build all subdirectories automatically
 
+all:: runtime.o
+
 LEVEL = ../..
 DIRS  := $(sort $(filter-out Output/, $(filter-out CVS/, $(wildcard */))))
 
@@ -11,3 +13,6 @@ include ${LEVEL}/Makefile.common
 install::
 
 clean::
+
+runtime.o: ../runtime.c
+	$(CC) -c $(CFLAGS) $<