diff --git a/scripts/_common.sh b/scripts/_common.sh
index 601fa68..ad1e2f3 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -8,82 +8,10 @@
 # dependencies used by the app
 pkg_dependencies="build-essential libirrlicht-dev cmake libbz2-dev libpng-dev libjpeg-dev libxxf86vm-dev libgl1-mesa-dev libsqlite3-dev libogg-dev libvorbis-dev libopenal-dev libcurl4-gnutls-dev libfreetype6-dev zlib1g-dev libgmp-dev libjsoncpp-dev libluajit-5.1-dev"
 
-#=================================================
-# PERSONAL HELPERS
-#=================================================
-
-# To remove once https://github.com/YunoHost/yunohost/pull/827 get merged
-ynh_find_port () {
-	# Declare an array to define the options of this helper.
-	local legacy_args=p
-	declare -Ar args_array=( [p]=port= )
-	local port
-	# Manage arguments with getopts
-	ynh_handle_getopts_args "$@"
-
-	test -n "$port" || ynh_die --message="The argument of ynh_find_port must be a valid port."
-	while ss -nltu | grep -q -w :$port       # Check if the port is free
-	do
-		port=$((port+1))	# Else, pass to next port
-	done
-	echo $port
-}
-
 #=================================================
 # EXPERIMENTAL HELPERS
 #=================================================
 
-# Need also the helper https://github.com/YunoHost-Apps/Experimental_helpers/blob/master/ynh_handle_getopts_args/ynh_handle_getopts_args
-
-# Read the value of a key in a ynh manifest file
-#
-# usage: ynh_read_manifest manifest key
-# | arg: -m, --manifest= - Path of the manifest to read
-# | arg: -k, --key= - Name of the key to find
-ynh_read_manifest () {
-	# Declare an array to define the options of this helper.
-	declare -Ar args_array=( [m]=manifest= [k]=key= )
-	local manifest
-	local key
-	# Manage arguments with getopts
-	ynh_handle_getopts_args "$@"
-
-	python3 -c "import sys, json;print(json.load(open('$manifest', encoding='utf-8'))['$key'])"
-}
-
-# Read the upstream version from the manifest
-# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
-# For example : 4.3-2~ynh3
-# This include the number before ~ynh
-# In the last example it return 4.3-2
-#
-# usage: ynh_app_upstream_version
-ynh_app_upstream_version () {
-    manifest_path="../manifest.json"
-    if [ ! -e "$manifest_path" ]; then
-        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
-    fi
-    version_key=$(ynh_read_manifest --manifest="$manifest_path" --key="version")
-    echo "${version_key/~ynh*/}"
-}
-
-# Read package version from the manifest
-# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
-# For example : 4.3-2~ynh3
-# This include the number after ~ynh
-# In the last example it return 3
-#
-# usage: ynh_app_package_version
-ynh_app_package_version () {
-    manifest_path="../manifest.json"
-    if [ ! -e "$manifest_path" ]; then
-        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
-    fi
-    version_key=$(ynh_read_manifest --manifest="$manifest_path" --key="version")
-    echo "${version_key/*~ynh/}"
-}
-
 #=================================================
 # FUTURE OFFICIAL HELPERS
 #=================================================
-