feelpp_excompiler: 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

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/feelpp_excompiler - from package: libfeel++1

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