zsyncmake: 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/zsyncmake - from package: zsync

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

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