mips64el-linux-gnuabi64-size: 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/mips64el-linux-gnuabi64-size - from package: binutils-mips64el-linux-gnuabi64

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

Error in other languages:
mips64el-linux-gnuabi64-size: bevel nie gevind nie
mips64el-linux-gnuabi64-size: comandă negăsită
mips64el-linux-gnuabi64-size: comando não encontrado
mips64el-linux-gnuabi64-size: commande introuvable
mips64el-linux-gnuabi64-size: command not found
mips64el-linux-gnuabi64-size: käsku ei ole
mips64el-linux-gnuabi64-size: không tìm thấy lệnh
mips64el-linux-gnuabi64-size: komanda nerasta
mips64el-linux-gnuabi64-size: Kommando nicht gefunden.
mips64el-linux-gnuabi64-size: kommandot finns inte
mips64el-linux-gnuabi64-size: komut yok
mips64el-linux-gnuabi64-size: nie znaleziono polecenia
mips64el-linux-gnuabi64-size: níor aimsíodh an t-ordú
mips64el-linux-gnuabi64-size: no se encontró la orden
mips64el-linux-gnuabi64-size: no s'ha trobat l'ordre
mips64el-linux-gnuabi64-size: opdracht niet gevonden
mips64el-linux-gnuabi64-size: parancs nem található
mips64el-linux-gnuabi64-size: perintah tidak ditemukan
mips64el-linux-gnuabi64-size: príkaz nenájdený
mips64el-linux-gnuabi64-size: příkaz nenalezen
mips64el-linux-gnuabi64-size: команда не найдена
mips64el-linux-gnuabi64-size: командата не е открита
mips64el-linux-gnuabi64-size: 命令找不到
mips64el-linux-gnuabi64-size: コマンドが見つかりません