extend_dmalloc: 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/extend_dmalloc - from package: kdesdk

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

On Debian possible default full paths are:

/usr/bin/extend_dmalloc - from package: kdesdk-scripts

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

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