diff --git a/.gitignore b/.gitignore
index 8b1f91b..07a9fb8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,6 @@
 /server
 /url/cookies
 ac-comphist.dat
+semanticdb
+ede-projects.el
+site-lisp/nxhtml/etc/schema/xhtml-loader.rnc
diff --git a/init.el b/init.el
index 11b9079..64170e0 100644
--- a/init.el
+++ b/init.el
@@ -19,6 +19,7 @@
 (load "~/.emacs.d/rc/rc-flymake.el")
 (load "~/.emacs.d/rc/rc-google-c-style.el")
 (load "~/.emacs.d/rc/rc-iedit.el")
+(load "~/.emacs.d/rc/rc-cedet.el")
 
 ;; Load ruby only when needed
 ;;(load "~/.emacs.d/rc/rc-ruby.el")
diff --git a/rc/rc-cedet.el b/rc/rc-cedet.el
new file mode 100644
index 0000000..367c454
--- /dev/null
+++ b/rc/rc-cedet.el
@@ -0,0 +1,25 @@
+;;; rc-cedet.el ---
+
+; turn on Semantic
+(semantic-mode 1)
+
+; lets' define a function which adds semantic as a suggestion backend to auto complete
+; and hook this function to c-mode-common-hook
+(defun my:add-semantic-to-autocomplete ()
+  (add-to-list 'ac-sources 'ac-source-semantic)
+)
+(add-hook 'c-mode-common-hook 'my:add-semantic-to-autocomplete)
+
+; turn on ede mode
+(global-ede-mode 1)
+
+;; load local projects if they exists
+(if (file-exists-p "~/my-ede-projects.el")
+    (load "~/my-ede-projects.el")
+  nil)
+
+; you can use system-include-path for setting up the system header file locaqtions.
+; turn on automatic reparsing of open buffers in semantic
+(global-semantic-idle-scheduler-mode 1)
+
+;;; rc-cedet.el ends here
diff --git a/rc/rc-elpa.el b/rc/rc-elpa.el
index 94e5da4..f866e5d 100755
--- a/rc/rc-elpa.el
+++ b/rc/rc-elpa.el
@@ -1,3 +1,4 @@
+;;; rc-elpa.el ---
 ;; configure melpa package archive
 
 (require 'package)
@@ -8,16 +9,30 @@
         ("melpa" . "http://melpa.milkbox.net/packages/")
         ("marmalade" . "http://marmalade-repo.org/packages/")))
 
-;; (progn
-;;   (switch-to-buffer
-;;    (url-retrieve-synchronously
-;;     "https://raw.github.com/milkypostman/melpa/master/melpa.el"))
-;;   (package-install-from-buffer (package-buffer-info) 'single))
+(defun ensure-package-installed (&rest packages)
+  "Assure every pacxkage is installed, ask for installation if it's not.
 
-;;(defadvice package-compute-transaction
-;;  (before package-compute-transaction-reverse (package-list requirements) activate compile)
-;;  "reverse the requirements"
-;;  (setq requirements (reverse requirements))
-;;  (print (requirements)))
+Return a list of installed packages or nil ofr every skipped package."
+  (mapcar
+   (lambda (package)
+     ;;(package-installed-p 'evil)
+     (if (package-installed-p package)
+         nil
+       (package-install package)))
+;;       (if (y-or-n-p (format "Package %s is missing. Install it? " package))
+;;           (package-install package)
+;;         package)))
+   packages))
+
+;; make sure to have downloaded archive description.
+;; Or use package-archive-contents as suggested by Nicolas Dudebout
+(or (file-exists-p package-user-dir)
+    (package-refresh-contents))
+
+;;(ensure-package-installed 'iedit 'magit) ; --> (nil nil) if iedit and magit are already installed
+
+;; activate installed packages
+;; (package-initialize)
 
 (package-initialize)
+;;; rc-elpa.el ends here
diff --git a/rc/rc-undo-tree.el b/rc/rc-undo-tree.el
index 219166e..64ec0d4 100644
--- a/rc/rc-undo-tree.el
+++ b/rc/rc-undo-tree.el
@@ -1,3 +1,6 @@
-;; rc-undo-tree.el
+;;; rc-undo-tree.el ---
+
+(ensure-package-installed 'undo-tree)
+
 (require 'undo-tree)
 (global-undo-tree-mode)
diff --git a/site-lisp/nxhtml/etc/schema/xhtml-loader.rnc b/site-lisp/nxhtml/etc/schema/xhtml-loader.rnc
deleted file mode 100755
index 2f24ec2..0000000
--- a/site-lisp/nxhtml/etc/schema/xhtml-loader.rnc
+++ /dev/null
@@ -1 +0,0 @@
-include "../../../../../../../Programs/emacs/etc/schema/xhtml.rnc"