diff -r fe9d746b273e -r bf2fecda8383 src/Tools/Haskell/Build.thy
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Tools/Haskell/Build.thy	Sat Nov 03 19:33:15 2018 +0100
@@ -0,0 +1,24 @@
+(*  Title:      Tools/Haskell/Build.thy
+    Author:     Makarius
+*)
+
+section \<open>Build Isabelle/Haskell modules\<close>
+
+theory Build imports Haskell
+begin
+
+ML_command \<open>
+  Isabelle_System.with_tmp_dir "ghc" (fn dir =>
+    let
+      val (out, rc) =
+        Isabelle_System.bash_output
+         (cat_lines
+           ["set -e",
+            "cd " ^ File.bash_path dir,
+            "cp " ^ File.bash_paths Haskell.source_modules ^ " .",
+            "\"$ISABELLE_GHC\" " ^ File.bash_paths (map Path.base Haskell.source_modules)]);
+    in if rc = 0 then writeln out else error out end
+  )
+\<close>
+
+end