coqmktop: 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/coqmktop - from package: libcoq-ocaml-dev

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

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