menhir: command not found

Have You tried accessing the binary with the full path?

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/menhir - from package: menhir

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