higan-performance: 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/higan-performance - from package: higan

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

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