HTMLLinker: 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/HTMLLinker - from package: gnustep-base

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

On Debian possible default full paths are:

/usr/bin/HTMLLinker - from package: gnustep-base-runtime

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

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