libftdi-config: 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/libftdi-config - from package: libftdi-devel

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

On Debian possible default full paths are:

/usr/bin/libftdi-config - from package: libftdi-dev

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

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