diff --git a/ext/cvode/Makefile.in b/ext/cvode/Makefile.in
index 58e8afb1d..03d9b9b6c 100755
--- a/ext/cvode/Makefile.in
+++ b/ext/cvode/Makefile.in
@@ -92,6 +92,8 @@ source/nvector.o: source/nvector.c include/nvector.h include/llnltyps.h \
 source/llnlmath.o: source/llnlmath.c include/llnlmath.h include/llnltyps.h
 	(cd source; $(COMPILER) $(OPTS) -c llnlmath.c)
 
+$(OBJS): Makefile
+
 clean:
 	$(RM)  @buildlib@/libcvode.a
 	$(RM)  $(OBJS)
diff --git a/ext/f2c_lapack/Makefile.in b/ext/f2c_lapack/Makefile.in
index 18bb4b0e1..bb2292ad7 100755
--- a/ext/f2c_lapack/Makefile.in
+++ b/ext/f2c_lapack/Makefile.in
@@ -128,6 +128,8 @@ depends:
 
 .depends: $(DEPENDS)
 	cat *.d > .depends
+
+$(OBJS): Makefile
  
 ifeq ($(wildcard .depends), .depends)
 include .depends
diff --git a/ext/f2c_libs/Makefile.in b/ext/f2c_libs/Makefile.in
index 3c6743556..4ae747a1e 100755
--- a/ext/f2c_libs/Makefile.in
+++ b/ext/f2c_libs/Makefile.in
@@ -199,6 +199,8 @@ arith.h: arithchk.c
 	./chkll >arith.h
 	rm -f chkll* arithchk.o
 
+$(OFILES): Makefile
+
 # depends target -> already in the Makefile
 depends:
 
diff --git a/ext/f2c_math/Makefile.in b/ext/f2c_math/Makefile.in
index e10954a80..b1bb0f125 100644
--- a/ext/f2c_math/Makefile.in
+++ b/ext/f2c_math/Makefile.in
@@ -101,6 +101,8 @@ depends:
 .depends: $(DEPENDS)
 	cat *.d > .depends
 
+$(OBJS): Makefile
+
 ifeq ($(wildcard .depends), .depends)
 include .depends
 endif