diff --git a/Makefile b/Makefile
index ecf9791a..f2b11aad 100644
--- a/Makefile
+++ b/Makefile
@@ -28,5 +28,8 @@ veryclean:
 	(cd tests/fileread; make clean)
 	(cd tests/pdegen; make clean)
 
+check: all
+	make check -C tests/pdegen
+
 clean:
 	(cd mlprec; make clean)
diff --git a/mlprec/Makefile b/mlprec/Makefile
index 3aea7cfc..1bb42258 100644
--- a/mlprec/Makefile
+++ b/mlprec/Makefile
@@ -76,9 +76,15 @@ LIBMOD=mld_prec_mod$(.mod)
 LOCAL_MODS=$(MODOBJS:.o=$(.mod))
 LIBNAME=libmld_prec.a
 
-lib: $(OBJS) 
+lib: $(LIBDIR)/$(LIBNAME)
+
+$(LIBNAME): $(OBJS) 
 	$(AR) $(HERE)/$(LIBNAME) $(OBJS)
 	$(RANLIB) $(HERE)/$(LIBNAME)
+
+
+# flea: if libdir misses some .mod file, it won't be copied unless the .a file is missing too  
+$(LIBDIR)/$(LIBNAME): $(LIBNAME) 
 	/bin/cp -p $(HERE)/$(LIBNAME) $(LIBDIR)
 	/bin/cp -p $(LIBMOD) $(LOCAL_MODS) mld_const.h $(LIBDIR)
 
diff --git a/tests/pdegen/Makefile b/tests/pdegen/Makefile
index e0f0ac07..1b0f3812 100644
--- a/tests/pdegen/Makefile
+++ b/tests/pdegen/Makefile
@@ -11,19 +11,31 @@ FINCLUDES=$(FMFLAG). $(FMFLAG)$(MLDLIBDIR)  $(FMFLAG)$(PSBINCDIR) $(FIFLAG).
 
 EXEDIR=./runs
 
-all: ppde spde
+all: $(EXEDIR)/spde $(EXEDIR)/ppde
+
+# FIXME: tp.c seems a ghost source ! 
+# $(EXEDIR)/tp
+
+check: all
+	cd $(EXEDIR) ; ./ppde < ppde.inp  
 
 ppde: ppde.o  data_input.o
 	$(F90LINK) ppde.o  data_input.o -o ppde $(MLD_LIB) $(PSBLAS_LIB) $(LDLIBS)
-	/bin/mv ppde $(EXEDIR)
 
 spde: spde.o   data_input.o
 	$(F90LINK) spde.o  data_input.o -o spde $(MLD_LIB) $(PSBLAS_LIB) $(LDLIBS)
-	/bin/mv spde $(EXEDIR)
 
-tp: tp.o   data_input.o
-	$(F90LINK) tp.o data_input.o  -o tp $(MLD_LIB) $(PSBLAS_LIB) $(LDLIBS)
-	/bin/mv tp $(EXEDIR)
+#tp: tp.o   data_input.o
+#	$(F90LINK) tp.o data_input.o  -o tp $(MLD_LIB) $(PSBLAS_LIB) $(LDLIBS)
+
+#$(EXEDIR)/tp: tp
+#	/bin/cp tp $(EXEDIR)
+
+$(EXEDIR)/ppde: ppde
+	/bin/cp ppde $(EXEDIR)
+
+$(EXEDIR)/spde: spde
+	/bin/cp spde $(EXEDIR)
 
 ppde.o spde.o: data_input.o