cairo-perf-diff-files: 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 Debian possible default full paths are:

/usr/bin/cairo-perf-diff-files - from package: cairo-perf-utils

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

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