smpicxx: 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 Debian possible default full paths are:

/usr/bin/smpicxx - from package: libsimgrid-dev

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

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