diff --git a/ext/nmatrix/extconf.rb b/ext/nmatrix/extconf.rb
index babef530..c8b55087 100644
--- a/ext/nmatrix/extconf.rb
+++ b/ext/nmatrix/extconf.rb
@@ -186,6 +186,8 @@ def gplusplus_version
   $libs += " -lclapack "
 end
 
+have_library('lapack_atlas', 'clapack_dgetrf')
+
 unless have_library("lapack")
   dir_config("lapack", idefaults[:lapack], ldefaults[:lapack])
 end