libassuan-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/libassuan-config - from package: libassuan-devel

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

On Debian possible default full paths are:

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

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

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