c_incl: 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/c_incl - from package: cook

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

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