diff --git a/CLAPACK/Makefile b/CLAPACK/Makefile
index 8e8971857..d64dafc1b 100644
--- a/CLAPACK/Makefile
+++ b/CLAPACK/Makefile
@@ -24,6 +24,8 @@ $(SRC)/lapack_WA.bc:  $(SRC)/Makefile
 
 $(SRC)/Makefile:
 	wget -q -O clapack.tgz http://www.netlib.org/clapack/clapack.tgz
+	md5sum --quiet --check checksums || (rm -f clapack.tgz; false)
+
 	tar xzf clapack.tgz
 	rm -rf $(SRC)
 	mv CLAPACK-$(CLAPACK_VERSION) $(SRC)
diff --git a/CLAPACK/checksums b/CLAPACK/checksums
new file mode 100644
index 000000000..257e37a7c
--- /dev/null
+++ b/CLAPACK/checksums
@@ -0,0 +1 @@
+040da31f3a7d4fbc9ac376c748d18d1f  clapack.tgz