svnchangesince: 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/svnchangesince - from package: kdesdk

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

On Debian possible default full paths are:

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

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

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