build.php: 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/share/doc/php-sabre-dav-1.8.12/bin/build.php - from package: php-sabre-dav

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

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