fftw-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 CentOS possible default full paths are:

/usr/bin/fftw-wisdom - from package: fftw

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/fftw-wisdom - from package: libfftw3-bin

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

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