c89-gcc: 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/c89-gcc - from package: gcc

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

Error in other languages:
c89-gcc: bevel nie gevind nie
c89-gcc: comandă negăsită
c89-gcc: comando não encontrado
c89-gcc: commande introuvable
c89-gcc: command not found
c89-gcc: käsku ei ole
c89-gcc: không tìm thấy lệnh
c89-gcc: komanda nerasta
c89-gcc: Kommando nicht gefunden.
c89-gcc: kommandot finns inte
c89-gcc: komut yok
c89-gcc: nie znaleziono polecenia
c89-gcc: níor aimsíodh an t-ordú
c89-gcc: no se encontró la orden
c89-gcc: no s'ha trobat l'ordre
c89-gcc: opdracht niet gevonden
c89-gcc: parancs nem található
c89-gcc: perintah tidak ditemukan
c89-gcc: príkaz nenájdený
c89-gcc: příkaz nenalezen
c89-gcc: команда не найдена
c89-gcc: командата не е открита
c89-gcc: 命令找不到
c89-gcc: コマンドが見つかりません