pic2graph: 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/pic2graph - from package: groff

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

On Debian possible default full paths are:

/usr/bin/pic2graph - from package: groff

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

Error in other languages:
pic2graph: bevel nie gevind nie
pic2graph: comandă negăsită
pic2graph: comando não encontrado
pic2graph: commande introuvable
pic2graph: command not found
pic2graph: käsku ei ole
pic2graph: không tìm thấy lệnh
pic2graph: komanda nerasta
pic2graph: Kommando nicht gefunden.
pic2graph: kommandot finns inte
pic2graph: komut yok
pic2graph: nie znaleziono polecenia
pic2graph: níor aimsíodh an t-ordú
pic2graph: no se encontró la orden
pic2graph: no s'ha trobat l'ordre
pic2graph: opdracht niet gevonden
pic2graph: parancs nem található
pic2graph: perintah tidak ditemukan
pic2graph: príkaz nenájdený
pic2graph: příkaz nenalezen
pic2graph: команда не найдена
pic2graph: командата не е открита
pic2graph: 命令找不到
pic2graph: コマンドが見つかりません