strip-tetex-src: 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 Debian possible default full paths are:

/usr/bin/strip-tetex-src - from package: ptex-buildsupport

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

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