fftwq-wisdom: 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/fftwq-wisdom - from package: libfftw3-bin

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

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