intltool-extract: 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/intltool-extract - from package: intltool

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

On Debian possible default full paths are:

/usr/bin/intltool-extract - from package: intltool

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

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