diff --git a/bio.lisp b/bio.lisp
index 2903eb8..228d041 100644
--- a/bio.lisp
+++ b/bio.lisp
@@ -2,6 +2,8 @@
 ;;;
 ;;; See LICENSE for details.
 
+#+xcvb (module (:depends-on ("package")))
+
 (in-package cl+ssl)
 
 (defconstant +bio-type-socket+ (logior 5 #x0400 #x0100))
diff --git a/build.xcvb b/build.xcvb
new file mode 100644
index 0000000..6665395
--- /dev/null
+++ b/build.xcvb
@@ -0,0 +1,25 @@
+;;; -*- mode: lisp -*-
+;;;
+;;; Copyright (C) 2001, 2003  Eric Marsden
+;;; Copyright (C) 2005  David Lichteblau
+;;; Copyright (C) 2007  Pixel // pinterface
+;;; "the conditions and ENSURE-SSL-FUNCALL are by Jochen Schmidt."
+;;;
+;;; See LICENSE for details.
+
+
+#+xcvb
+(module
+ (:fullname "cl+ssl"
+  :depends-on ("package"
+	       "reload"
+	       "conditions"
+	       "ffi"
+	       "ffi-buffer-all"
+	       (:cond ((:featurep :clisp) "ffi-buffer-clisp")
+                      ((:featurep (:not :clisp)) "ffi-buffer"))
+	       "streams"
+	       "bio")
+  :build-depends-on ("flexi-streams" "trivial-gray-streams" "cffi")
+  :supersedes-asdf ("cl+ssl")))
+
diff --git a/conditions.lisp b/conditions.lisp
index 3e94d8d..716d76d 100644
--- a/conditions.lisp
+++ b/conditions.lisp
@@ -4,6 +4,8 @@
 ;;;
 ;;; See LICENSE for details.
 
+#+xcvb (module (:depends-on ("package")))
+
 (in-package :cl+ssl)
 
 (eval-when (:compile-toplevel :load-toplevel :execute)
diff --git a/ffi-buffer-all.lisp b/ffi-buffer-all.lisp
index 0257db0..60d3e17 100644
--- a/ffi-buffer-all.lisp
+++ b/ffi-buffer-all.lisp
@@ -1,3 +1,5 @@
+#+xcvb (module (:depends-on ("package")))
+
 (in-package :cl+ssl)
 
 (defconstant +initial-buffer-size+ 2048)
diff --git a/ffi-buffer-clisp.lisp b/ffi-buffer-clisp.lisp
index 156e4c4..77d98c5 100644
--- a/ffi-buffer-clisp.lisp
+++ b/ffi-buffer-clisp.lisp
@@ -1,3 +1,5 @@
+#+xcvb (module (:depends-on ("package" "reload" "conditions" "ffi" "ffi-buffer-all")))
+
 (in-package :cl+ssl)
 
 (defun make-buffer (size)
diff --git a/ffi-buffer.lisp b/ffi-buffer.lisp
index b023e59..685bb79 100644
--- a/ffi-buffer.lisp
+++ b/ffi-buffer.lisp
@@ -1,3 +1,5 @@
+#+xcvb (module (:depends-on ("package")))
+
 (in-package :cl+ssl)
 
 (defun make-buffer (size)
diff --git a/ffi.lisp b/ffi.lisp
index 96b3fb7..ad436c1 100644
--- a/ffi.lisp
+++ b/ffi.lisp
@@ -4,6 +4,8 @@
 ;;;
 ;;; See LICENSE for details.
 
+#+xcvb (module (:depends-on ("package" "conditions")))
+
 (eval-when (:compile-toplevel)
   (declaim
    (optimize (speed 3) (space 1) (safety 1) (debug 0) (compilation-speed 0))))
diff --git a/package.lisp b/package.lisp
index 1b536bb..5df06c4 100644
--- a/package.lisp
+++ b/package.lisp
@@ -4,6 +4,8 @@
 ;;;
 ;;; See LICENSE for details.
 
+#+xcvb (module (:depends-on ((:when (:featurep :sbcl) (:require :sb-posix)))))
+
 (in-package :cl-user)
 
 (defpackage :cl+ssl
diff --git a/reload.lisp b/reload.lisp
index 6e6b27f..3525ad4 100644
--- a/reload.lisp
+++ b/reload.lisp
@@ -13,6 +13,8 @@
 ;;;   - but not every time ffi.lisp is re-loaded as would happen if we
 ;;;     put this directly into ffi.lisp
 
+#+xcvb (module (:depends-on ("package")))
+
 (in-package :cl+ssl)
 
 (cffi:define-foreign-library libssl
diff --git a/streams.lisp b/streams.lisp
index 76b7b85..2c7c0a5 100644
--- a/streams.lisp
+++ b/streams.lisp
@@ -5,6 +5,12 @@
 ;;;
 ;;; See LICENSE for details.
 
+#+xcvb
+(module
+ (:depends-on ("package" "conditions" "ffi"
+                         (:cond ((:featurep :clisp) "ffi-buffer-clisp")
+                                (t "ffi-buffer")))))
+
 (eval-when (:compile-toplevel)
   (declaim
    (optimize (speed 3) (space 1) (safety 1) (debug 0) (compilation-speed 0))))