qlalr: 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/qlalr - from package: qt5-qtbase-devel
/usr/lib64/qt5/bin/qlalr - from package: qt5-qtbase-devel
/usr/lib/qt5/bin/qlalr - from package: qt5-qtbase-devel

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

On Debian possible default full paths are:

/usr/bin/qlalr - from package: qtchooser
/usr/lib/x86_64-linux-gnu/qt5/bin/qlalr - from package: qtbase5-dev-tools

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

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