http://math-atlas.sourceforge.net/errata.html
make kill from topdir removes libraries

--- Make.top	Mon Dec 22 09:06:32 2003
+++ Make.top	Wed Mar  7 02:15:31 2007
@@ -211,7 +211,6 @@
 	rm -rf src/blas/reference/level1/$(arch)
 	rm -rf src/auxil/$(arch)
 	rm -rf src/testing/$(arch)
-	rm -rf lib/$(arch)
 	rm -rf bin/$(arch)
 
 killall :