diff --git a/MPI/OPAL/1.6/variants.Darwin b/MPI/OPAL/1.6/variants.Darwin
new file mode 100644
index 0000000..3504079
--- /dev/null
+++ b/MPI/OPAL/1.6/variants.Darwin
@@ -0,0 +1,2 @@
+OPAL/1.6.0rc1	unstable gcc/5.4.0 openmpi/1.10.4 boost/1.62.0 hdf5/1.8.18 H5hut/2.0.0rc3 gsl/2.2.1 trilinos/12.10.1 b:cmake/3.6.3 b:OpenBLAS/0.2.19
+