neon-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/neon-config - from package: neon-devel

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

On Debian possible default full paths are:

/usr/bin/neon-config - from package: libneon27-dev
/usr/bin/neon-config - from package: libneon27-gnutls-dev

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

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