amd64-mingw32msvc-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/amd64-mingw32msvc-size - from package: mingw32-binutils

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

Error in other languages:
amd64-mingw32msvc-size: bevel nie gevind nie
amd64-mingw32msvc-size: comandă negăsită
amd64-mingw32msvc-size: comando não encontrado
amd64-mingw32msvc-size: commande introuvable
amd64-mingw32msvc-size: command not found
amd64-mingw32msvc-size: käsku ei ole
amd64-mingw32msvc-size: không tìm thấy lệnh
amd64-mingw32msvc-size: komanda nerasta
amd64-mingw32msvc-size: Kommando nicht gefunden.
amd64-mingw32msvc-size: kommandot finns inte
amd64-mingw32msvc-size: komut yok
amd64-mingw32msvc-size: nie znaleziono polecenia
amd64-mingw32msvc-size: níor aimsíodh an t-ordú
amd64-mingw32msvc-size: no se encontró la orden
amd64-mingw32msvc-size: no s'ha trobat l'ordre
amd64-mingw32msvc-size: opdracht niet gevonden
amd64-mingw32msvc-size: parancs nem található
amd64-mingw32msvc-size: perintah tidak ditemukan
amd64-mingw32msvc-size: príkaz nenájdený
amd64-mingw32msvc-size: příkaz nenalezen
amd64-mingw32msvc-size: команда не найдена
amd64-mingw32msvc-size: командата не е открита
amd64-mingw32msvc-size: 命令找不到
amd64-mingw32msvc-size: コマンドが見つかりません