diff -u -r ../ghc-8.0.1/configure ./configure
--- ../ghc-8.0.1/configure	2016-05-17 12:36:51.000000000 -0400
+++ ./configure	2016-06-23 16:46:28.690875698 -0400
@@ -7126,7 +7126,7 @@
 # tools we are looking for. In the past, GHC supported a number of
 # versions of LLVM simultaneously, but that stopped working around
 # 3.5/3.6 release of LLVM.
-LlvmVersion=3.7
+LlvmVersion=3.9
 
 sUPPORTED_LLVM_VERSION=$(echo \($LlvmVersion\) | sed 's/\./,/')