ccomps: 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/ccomps - from package: graphviz

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

On Debian possible default full paths are:

/usr/bin/ccomps - from package: graphviz

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

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