rootcint: 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/rootcint - from package: root-cint

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

On Debian possible default full paths are:

/usr/bin/rootcint - from package: libroot-core-dev

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

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