lablgl: 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/lablgl - from package: ocaml-lablgl

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

On Debian possible default full paths are:

/usr/bin/lablgl - from package: liblablgl-ocaml-dev

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

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