diff -ur libprelude-0.9.20.orig/tests/Makefile.in libprelude-0.9.20/tests/Makefile.in
--- libprelude-0.9.20.orig/tests/Makefile.in	2008-09-03 11:58:21.000000000 -0400
+++ libprelude-0.9.20/tests/Makefile.in	2008-09-04 11:02:38.000000000 -0400
@@ -1012,7 +1012,7 @@
 @HAVE_VALGRIND_TRUE@	$(MAKE) valgrind
 
 @HAVE_VALGRIND_TRUE@%.valgrind: %
-@HAVE_VALGRIND_TRUE@	libtool --mode=execute                                  \
+@HAVE_VALGRIND_TRUE@	$(LIBTOOL) --mode=execute                                  \
 @HAVE_VALGRIND_TRUE@	$(VALGRIND) -q                                          \
 @HAVE_VALGRIND_TRUE@	--tool=memcheck --leak-check=full --trace-children=yes  \
 @HAVE_VALGRIND_TRUE@	--leak-resolution=high --num-callers=20                 \