diff --git a/scripts/_common.sh b/scripts/_common.sh
new file mode 100644
index 0000000..54ff881
--- /dev/null
+++ b/scripts/_common.sh
@@ -0,0 +1,105 @@
+#
+# Common variables
+#
+
+APPNAME="odoo"
+
+
+# Package name for dependencies
+DEPS_PKG_NAME="${APPNAME}-deps"
+
+# Remote URL to fetch tarball
+SOURCE_URL="http://download.gna.org/wkhtmltopdf/0.12/0.12.4/wkhtmltox-0.12.4_linux-generic-amd64.tar.xz"
+
+# Remote URL to fetch tarball checksum
+SOURCE_SHA256="049b2cdec9a8254f0ef8ac273afaf54f7e25459a273e27189591edc7d7cf29db"
+
+# App package root directory should be the parent folder
+PKGDIR=$(cd ../; pwd)
+
+#
+# Common helpers
+#
+
+# Create a user
+#
+# usage: ynh_mysql_create_user user pwd [host]
+# | arg: user - the user name to create
+# | arg: pwd - the password to identify user by
+ynh_psql_create_user() {
+        sudo su -c "psql" postgres <<< \
+        "CREATE USER ${1} WITH PASSWORD '${2}';"
+}
+
+# Create a database and grant optionnaly privilegies to a user
+#
+# usage: ynh_mysql_create_db db [user [pwd]]
+# | arg: db - the database name to create
+# | arg: user - the user to grant privilegies
+# | arg: pwd - the password to identify user by
+ynh_psql_create_db() {
+    db=$1
+    # grant all privilegies to user
+    if [[ $# -gt 1 ]]; then
+        ynh_psql_create_user ${2} "${3}"
+        sudo su -c "createdb -O ${2} $db" postgres
+    else
+        sudo su -c "createdb $db" postgres
+    fi
+
+}
+
+# Drop a database
+#
+# usage: ynh_mysql_drop_db db
+# | arg: db - the database name to drop
+ynh_psql_drop_db() {
+    sudo su -c "dropdb ${1}" postgres
+}
+
+# Drop a user
+#
+# usage: ynh_mysql_drop_user user
+# | arg: user - the user name to drop
+ynh_psql_drop_user() {
+    sudo su -c "dropuser ${1}" postgres
+}
+
+
+# Download and extract sources to the given directory
+# usage: extract_sources DESTDIR [AS_USER]
+extract_sources() {
+  local DESTDIR=$1
+  local AS_USER=${2:-admin}
+
+  # retrieve and extract Roundcube tarball
+  tarball="/tmp/${APPNAME}.tar.gz"
+  rm -f "$tarball"
+  wget -q -O "$tarball" "$SOURCE_URL" \
+    || ynh_die "Unable to download tarball"
+  echo "$SOURCE_SHA256 $tarball" | sha256sum -c >/dev/null \
+    || ynh_die "Invalid checksum of downloaded tarball"
+  exec_as "$AS_USER" tar xzf "$tarball" -C "$DESTDIR" --strip-components 1 \
+    || ynh_die "Unable to extract tarball"
+  rm -f "$tarball"
+
+  # apply patches
+  (cd "$DESTDIR" \
+   && for p in ${PKGDIR}/patches/*.patch; do \
+        exec_as "$AS_USER" patch -p1 < $p; done) \
+    || ynh_die "Unable to apply patches"
+}
+
+# Execute a command as another user
+# usage: exec_as USER COMMAND [ARG ...]
+exec_as() {
+  local USER=$1
+  shift 1
+
+  if [[ $USER = $(whoami) ]]; then
+    eval "$@"
+  else
+    # use sudo twice to be root and be allowed to use another user
+    sudo sudo -u "$USER" "$@"
+  fi
+}
diff --git a/scripts/install b/scripts/install
index 3a7c996..f584296 100644
--- a/scripts/install
+++ b/scripts/install
@@ -11,6 +11,9 @@ admin_password=$YNH_APP_ARG_ADMIN_PASSWORD
 database_password=$YNH_APP_ARG_DATABASE_PASSWORD
 lang=$YNH_APP_ARG_LANG
 
+# Load common variables
+source ./_common.sh
+
 # Source YunoHost helpers
 . /usr/share/yunohost/helpers
 
@@ -52,12 +55,19 @@ else
 
   	# Initialize installation
     ynh_package_install postgresql
-    sudo su -c "psql" postgres <<< \
-    "CREATE USER $app WITH PASSWORD '$database_password' CREATEDB;"
+    # This db may be unused
+    dbuser=$app
+    dbname=$app
+    ynh_psql_create_db "$dbname" "$dbuser" "$database_password"
     ynh_package_install odoo
 
     # Install wkhtmltopdf to print PDF reports
-    ynh_package_install wkhtmltopdf
+    ynh_package_install xfonts-75dpi xfonts-base wkhtmltopdf
+
+    # The debian package has a bug so we deploy a more recent version    
+    extract_sources "/usr/" "$app"
+
+
 
     # Set admin password
     # TODO Support @ in password
@@ -79,22 +89,6 @@ else
     sudo yunohost service start odoo
 fi
 
-ynh_psql_create_user() {
-        sudo su -c "psql" postgres <<< \
-        "CREATE USER ${1} WITH PASSWORD '${2}';"
-}
-ynh_psql_create_db() {
-    db=$1
-    # grant all privilegies to user
-    if [[ $# -gt 1 ]]; then
-        ynh_psql_create_user ${2} '${3}'
-        sudo su -c "createdb -O ${2} $db" postgres
-    else
-        sudo su -c "createdb $db" postgres
-    fi
-
-}
-
 # Configure Nginx and reload
 sed -i "s@#YNH_APP_INSTANCE_NAME#@${YNH_APP_INSTANCE_NAME}@g" ../conf/nginx.conf
 sudo cp ../conf/nginx.conf /etc/nginx/conf.d/$domain.d/$app.conf
diff --git a/scripts/remove b/scripts/remove
index 3fbc58a..686b6dd 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -2,6 +2,10 @@
 set -eu
 
 app=$YNH_APP_INSTANCE_NAME
+
+# Load common variables
+source ./_common.sh
+
 # Source YunoHost helpers
 . /usr/share/yunohost/helpers