diff -r 1722cc56d22e -r 7ff6284c0d84 lib/Tools/ghc_setup
--- a/lib/Tools/ghc_setup	Wed Oct 17 22:41:59 2018 +0200
+++ b/lib/Tools/ghc_setup	Thu Oct 18 12:30:26 2018 +0200
@@ -4,5 +4,5 @@
 #
 # DESCRIPTION: setup Glasgow Haskell Compiler setup via Stack
 
-isabelle_stack setup --resolver "$ISABELLE_STACK_RESOLVER" &&
+isabelle_stack setup --resolver "$ISABELLE_STACK_RESOLVER" "$ISABELLE_GHC_VERSION" &&
   isabelle_stack ghci --ghci-options --version