dmtcp_launch: 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/dmtcp_launch - from package: dmtcp

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

On Debian possible default full paths are:

/usr/bin/dmtcp_launch - from package: dmtcp

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