Have tuareg mode set the compile command

to utilize corebuild via opam

modules/prelude-ocaml.el

@@ -49,7 +49,9 @@
 (add-hook 'tuareg-mode-hook (lambda ()
                               (progn
                                 (define-key tuareg-mode-map (kbd "C-c C-s")
-                                  'utop))))
+                                  'utop)
+                                (setq compile-command
+                                      "opam config exec \"corebuild \""))))
 
 ;; Setup merlin completions company is used by default in prelude
 (add-to-list 'company-backends 'merlin-company-backend)