qmlprofiler: 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/lib64/qt5/bin/qmlprofiler - from package: qt5-qtdeclarative-devel
/usr/lib/qt5/bin/qmlprofiler - from package: qt5-qtdeclarative-devel

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

On Debian possible default full paths are:

/usr/bin/qmlprofiler - from package: qtchooser
/usr/lib/x86_64-linux-gnu/qt5/bin/qmlprofiler - from package: qtdeclarative5-dev-tools

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

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