pypy-c: 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/lib/pypy/bin/pypy-c - from package: pypy

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

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