xtractprotos: command not found

Have You tried accessing the binary with the full path?

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/xtractprotos - from package: leptonica-progs

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