test_chmLib: 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/test_chmLib - from package: chmlib

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

On Debian possible default full paths are:

/usr/bin/test_chmLib - from package: libchm-bin

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

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