diff --git a/Makefile b/Makefile
index 5e623bd6..f600ff1c 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,8 @@ install:
 	   $(INSTALL_DATA) lib/*.a  $(INSTALL_LIBDIR))
 	(./mkdir.sh $(INSTALL_INCLUDEDIR) && \
 	   $(INSTALL_DATA) lib/*$(.mod) $(INSTALL_INCLUDEDIR))
+	(./mkdir.sh $(INSTALL_INCLUDEDIR) && \
+	   $(INSTALL_DATA) lib/*.h $(INSTALL_INCLUDEDIR))
 	(./mkdir.sh  $(INSTALL_DOCSDIR) && \
 	   /bin/cp -fr docs/*pdf docs/html $(INSTALL_DOCSDIR))
 veryclean: 
diff --git a/mlprec/Makefile b/mlprec/Makefile
index 657a4a83..3aea7cfc 100644
--- a/mlprec/Makefile
+++ b/mlprec/Makefile
@@ -80,7 +80,7 @@ lib: $(OBJS)
 	$(AR) $(HERE)/$(LIBNAME) $(OBJS)
 	$(RANLIB) $(HERE)/$(LIBNAME)
 	/bin/cp -p $(HERE)/$(LIBNAME) $(LIBDIR)
-	/bin/cp -p $(LIBMOD) $(LOCAL_MODS) $(LIBDIR)
+	/bin/cp -p $(LIBMOD) $(LOCAL_MODS) mld_const.h $(LIBDIR)
 
 mld_s_prec_type.o mld_d_prec_type.o mld_c_prec_type.o mld_z_prec_type.o	: mld_base_prec_type.o
 mld_prec_type.o: mld_s_prec_type.o mld_d_prec_type.o mld_c_prec_type.o mld_z_prec_type.o