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diff --git a/src/geiser/evaluation.scm b/src/geiser/evaluation.scm
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+;;; evaluation.scm -- evaluation, compilation and macro-expansion
+
+;; Copyright (C) 2009, 2010, 2011, 2013, 2015 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Mon Mar 02, 2009 02:46
+
+(cond-expand
+  (guile-2.2
+   (define-module (geiser evaluation)
+     #:export (ge:compile
+               ge:eval
+               ge:macroexpand
+               ge:compile-file
+               ge:load-file
+               ge:set-warnings
+               ge:add-to-load-path)
+     #:use-module (geiser modules)
+     #:use-module (srfi srfi-1)
+     #:use-module (language tree-il)
+     #:use-module (system base compile)
+     #:use-module (system base message)
+     #:use-module (system base pmatch)
+     #:use-module (system vm program)
+     #:use-module (ice-9 pretty-print)
+     #:use-module (system vm loader)))
+  (else
+   (define-module (geiser evaluation)
+     #:export (ge:compile
+               ge:eval
+               ge:macroexpand
+               ge:compile-file
+               ge:load-file
+               ge:set-warnings
+               ge:add-to-load-path)
+     #:use-module (geiser modules)
+     #:use-module (srfi srfi-1)
+     #:use-module (language tree-il)
+     #:use-module (system base compile)
+     #:use-module (system base message)
+     #:use-module (system base pmatch)
+     #:use-module (system vm program)
+     #:use-module (ice-9 pretty-print))))
+
+
+(define compile-opts '())
+(define compile-file-opts '())
+
+(define default-warnings '(arity-mismatch unbound-variable format))
+(define verbose-warnings `(unused-variable ,@default-warnings))
+
+(define (ge:set-warnings wl)
+  (let* ((warns (cond ((list? wl) wl)
+                      ((symbol? wl) (case wl
+                                      ((none nil null) '())
+                                      ((medium default) default-warnings)
+                                      ((high verbose) verbose-warnings)
+                                      (else '())))
+                      (else '())))
+         (fwarns (if (memq 'unused-variable warns)
+                     (cons 'unused-toplevel warns)
+                     warns)))
+    (set! compile-opts (list #:warnings warns))
+    (set! compile-file-opts (list #:warnings fwarns))))
+
+(ge:set-warnings 'none)
+
+(define (call-with-result thunk)
+  (letrec* ((result #f)
+            (output
+             (with-output-to-string
+               (lambda ()
+                 (with-fluids ((*current-warning-port* (current-output-port))
+                               (*current-warning-prefix* ""))
+                   (with-error-to-port (current-output-port)
+                     (lambda () (set! result
+                                  (map object->string (thunk))))))))))
+    (write `((result ,@result) (output . ,output)))
+    (newline)))
+
+(define (ge:compile form module)
+  (compile* form module compile-opts))
+
+(define (compile* form module-name opts)
+  (let* ((module (or (find-module module-name) (current-module)))
+         (ev (lambda ()
+               (call-with-values
+                   (lambda ()
+                     (let* ((to (cond-expand (guile-2.2 'bytecode)
+                                             (else 'objcode)))
+                            (cf (cond-expand (guile-2.2 load-thunk-from-memory)
+                                             (else make-program)))
+                            (o (compile form
+                                        #:to to
+                                        #:env module
+                                        #:opts opts))
+                            (thunk (cf o)))
+                       (start-stack 'geiser-evaluation-stack
+                                    (eval `(,thunk) module))))
+                 (lambda vs vs)))))
+    (call-with-result ev)))
+
+(define (ge:eval form module-name)
+  (let* ((module (or (find-module module-name) (current-module)))
+         (ev (lambda ()
+               (call-with-values
+                   (lambda () (eval form module))
+                 (lambda vs vs)))))
+    (call-with-result ev)))
+
+(define (ge:compile-file path)
+  (call-with-result
+   (lambda ()
+     (let ((cr (compile-file path
+                             #:canonicalization 'absolute
+                             #:opts compile-file-opts)))
+       (and cr
+            (list (object->string (save-module-excursion
+                                   (lambda () (load-compiled cr))))))))))
+
+(define ge:load-file ge:compile-file)
+
+(define (ge:macroexpand form . all)
+  (let ((all (and (not (null? all)) (car all))))
+    (with-output-to-string
+      (lambda ()
+        (pretty-print (tree-il->scheme (macroexpand form)))))))
+
+(define (add-to-list lst dir)
+  (and (not (member dir lst))))
+
+(define (ge:add-to-load-path dir)
+  (and (file-is-directory? dir)
+       (let ((in-lp (member dir %load-path))
+             (in-clp (member dir %load-compiled-path)))
+         (when (not in-lp)
+           (set! %load-path (cons dir %load-path)))
+         (when (not in-clp)
+           (set! %load-compiled-path (cons dir %load-compiled-path)))
+         (or in-lp in-clp))))