fvcmpp: 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 CentOS possible default full paths are:

/usr/bin/fvcmpp - from package: fawkes-firevision-tools

You may install the required package with command yum install {package}

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