gcov34: 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/gcov34 - from package: compat-gcc-34

You may install the required package with command yum install {package}
Error in other languages:
gcov34: bevel nie gevind nie
gcov34: comandă negăsită
gcov34: comando não encontrado
gcov34: commande introuvable
gcov34: command not found
gcov34: käsku ei ole
gcov34: không tìm thấy lệnh
gcov34: komanda nerasta
gcov34: Kommando nicht gefunden.
gcov34: kommandot finns inte
gcov34: komut yok
gcov34: nie znaleziono polecenia
gcov34: níor aimsíodh an t-ordú
gcov34: no se encontró la orden
gcov34: no s'ha trobat l'ordre
gcov34: opdracht niet gevonden
gcov34: parancs nem található
gcov34: perintah tidak ditemukan
gcov34: príkaz nenájdený
gcov34: příkaz nenalezen
gcov34: команда не найдена
gcov34: командата не е открита
gcov34: 命令找不到
gcov34: コマンドが見つかりません