diff --git a/Compiler/openmpi/files/variants.Darwin b/Compiler/openmpi/files/variants.Darwin
index 4014bb6..b365480 100644
--- a/Compiler/openmpi/files/variants.Darwin
+++ b/Compiler/openmpi/files/variants.Darwin
@@ -23,3 +23,4 @@ openmpi/3.0.2	stable		gcc/7.3.0
 openmpi/3.1.1	stable		gcc/7.3.0
 openmpi/3.1.2	stable		gcc/7.3.0
 openmpi/3.1.3	stable		gcc/7.3.0
+openmpi/3.1.3	unstable		clang-macos/10.0.1