NSBrowserTest: command not found

Have You tried accessing the binary with the full path?

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/NSBrowserTest - from package: gnustep-examples

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

On Debian possible default full paths are:

/usr/bin/NSBrowserTest - from package: gnustep-examples

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