count: 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/llvm-3.4/bin/count - from package: llvm-3.4-tools
/usr/lib/llvm-3.5/bin/count - from package: llvm-3.5-tools

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

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