diff -r b979e3044d8e -r b5286c564861 lib/scripts/getsettings
--- a/lib/scripts/getsettings	Wed Mar 20 21:54:08 2019 +0100
+++ b/lib/scripts/getsettings	Wed Mar 20 21:57:02 2019 +0100
@@ -105,8 +105,8 @@
 fi
 
 #enforce ISABELLE_GHC
-if [ -d "$ISABELLE_STACK_ROOT" -a -f "$ISABELLE_STACK_ROOT/ISABELLE_GHC_PROGRAMS" ]; then
-  if [ -f "$(cat "$ISABELLE_STACK_ROOT/ISABELLE_GHC_PROGRAMS")/$ISABELLE_GHC_VERSION/bin/ghc" ]; then
+if [ -f "$ISABELLE_STACK_ROOT/ISABELLE_GHC_EXE-$ISABELLE_PLATFORM_FAMILY" ]; then
+  if [ -f "$(cat "$ISABELLE_STACK_ROOT/ISABELLE_GHC_EXE-$ISABELLE_PLATFORM_FAMILY")" ]; then
     ISABELLE_GHC="$ISABELLE_HOME/lib/scripts/ghc"
     ISABELLE_GHC_STACK=true
   fi