gl-conf-convert: 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/gl-conf-convert - from package: gitolite

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

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