diff --git a/install.sh b/install.sh
index 1a1605b..3367110 100755
--- a/install.sh
+++ b/install.sh
@@ -44,6 +44,7 @@ if [[ $CURDIR != '/opt/miaou-bash' ]]; then
     fi
 
 else
-    apt-get install -y "${REQUIRED_PKGS[@]}"
+    source "$CURDIR/lib/functions.sh"
+    "$CURDIR/tools/idem_apt_install" "${REQUIRED_PKGS[@]}"
     ./init.sh
 fi
diff --git a/lib/functions.sh b/lib/functions.sh
index 17dfb30..40f64c7 100644
--- a/lib/functions.sh
+++ b/lib/functions.sh
@@ -18,6 +18,18 @@ function isArray {
   [[ "$(declare -p "$1" 2>/dev/null)" =~ "declare -a" ]] || return 1
 }
 
+function isDebian {
+  grep ^ID=debian /etc/os-release
+}
+
+function isArch {
+  grep ^ID=arch /etc/os-release
+}
+
+function os-release {
+  grep ^ID= /etc/os-release | cut -d '=' -f2
+}
+
 function askConfirmation {
   case "$1" in
   y | Y | yes | YES)
diff --git a/tools/idem_apt_install b/tools/idem_apt_install
index a00468d..ac77959 100755
--- a/tools/idem_apt_install
+++ b/tools/idem_apt_install
@@ -1,25 +1,51 @@
 #!/bin/bash
 
+source "$MIAOU_BASH_DIR"/lib/functions.sh
+
 function usage {
     local BASECMD
     BASECMD=$(basename "$0")
     echo "usage: $BASECMD <packages...>"
-    echo 'idempotent debian package installation : update if necessary, install only if not yet done'
+    case $(os-release) in
+    debian)
+        echo 'idempotent debian package installation : update if necessary, install only if not yet done'
+        ;;
+    arch)
+        echo 'idempotent archlinux package installation : update if necessary, install only if not yet done'
+        ;;
+    esac
+
     exit 1
 }
 
 [ "$(id -u)" -ne 0 ] && echo 'root privilege required' && exit 2
 [[ $# -lt 1 ]] && usage
 
-if [ "$(date --date='-12 hours' +%s)" -gt "$(date -d "$(stat -c %y /var/lib/apt/lists/partial)" +%s)" ]; then
-    echo "updating repositoring..."
-    apt-get update
-fi
-
-for i in "$@"; do
-    if ! dpkg -l "$i" 2>/dev/null | grep -q ^ii; then
-        sudo apt-get install -y "$i"
-    elif [ -n "${VERBOSE+x}" ] && $VERBOSE; then
-        echo "apt package <$i> already installed!"
+case $(os-release) in
+debian)
+    if [ "$(date --date='-12 hours' +%s)" -gt "$(date -d "$(stat -c %y /var/lib/apt/lists/partial)" +%s)" ]; then
+        echo "updating repositoring..."
+        apt-get update
     fi
-done
+
+    for i in "$@"; do
+        if ! dpkg -l "$i" 2>/dev/null | grep -q ^ii; then
+            sudo apt-get install -y "$i"
+        elif [ -n "${VERBOSE+x}" ] && $VERBOSE; then
+            echo "apt package <$i> already installed!"
+        fi
+    done
+    ;;
+arch)
+    for i in "$@"; do
+        if ! pacman -Ql "$i" 2>/dev/null | grep -q ^ii; then
+            sudo pacman -S "$i"
+        elif [ -n "${VERBOSE+x}" ] && $VERBOSE; then
+            echo "pacman package <$i> already installed!"
+        fi
+    done
+    ;;
+*)
+    echo "unknown os release <$(os-release)>!" && exit 2
+    ;;
+esac
diff --git a/tools/wget_semver b/tools/wget_semver
index aecc41b..f6516a2 100755
--- a/tools/wget_semver
+++ b/tools/wget_semver
@@ -42,7 +42,8 @@ function get_artcode {
 
 if [ -z "$(command -v git)" ]; then
 	echo "INSTALLING PACKAGE <GIT> required"
-	sudo apt install -y git
+	source "$MIAOU_BASH_DIR/lib/functions.sh"
+	"$CURDIR/tools/idem_apt_install" git
 fi
 
 case $REPO_TYPE in