ldclt: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/ldclt - from package: 389-ds-base

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ldclt - from package: 389-ds-base

You may install the required package with command apt-get install {package}

Error in other languages:
ldclt: bevel nie gevind nie
ldclt: comandă negăsită
ldclt: comando não encontrado
ldclt: commande introuvable
ldclt: command not found
ldclt: käsku ei ole
ldclt: không tìm thấy lệnh
ldclt: komanda nerasta
ldclt: Kommando nicht gefunden.
ldclt: kommandot finns inte
ldclt: komut yok
ldclt: nie znaleziono polecenia
ldclt: níor aimsíodh an t-ordú
ldclt: no se encontró la orden
ldclt: no s'ha trobat l'ordre
ldclt: opdracht niet gevonden
ldclt: parancs nem található
ldclt: perintah tidak ditemukan
ldclt: príkaz nenájdený
ldclt: příkaz nenalezen
ldclt: команда не найдена
ldclt: командата не е открита
ldclt: 命令找不到
ldclt: コマンドが見つかりません