dmtcp_checkpoint: 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/dmtcp_checkpoint - from package: dmtcp

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

On Debian possible default full paths are:

/usr/bin/dmtcp_checkpoint - from package: dmtcp

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

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