avr-gccbug: 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 CentOS possible default full paths are:

/usr/bin/avr-gccbug - from package: avr-gcc

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