icheck: 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/icheck - from package: qt-mobility-devel

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

On Debian possible default full paths are:

/usr/bin/icheck - from package: icheck
/usr/bin/icheck - from package: qtmobility-dev

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

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