builder: fix typo

diff --git a/builder b/builder
index 9a4a404..2d82fdb 100755 (executable)
--- a/builder
+++ b/builder
@@ -128,7 +128,7 @@ configure_opts = ['--prefix', prefix,
                   "LDFLAGS='-Wl,-L"+prefix+"/lib"
                   + " -Wl,-R"+prefix+"/lib'",
                   'CPPFLAGS="-I '+prefix+'/include"',
-                  '--with-system-libtool', '--with-system-ltdl',
+                  '--with-system-libtool', '--with-system-libltdl',
                   ]
 if options.configure_opts is not None: 
     configure_opts.extend(options.configure_opts)