uic3: 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/uic3 - from package: qt-devel
/usr/lib64/qt4/bin/uic3 - from package: qt-devel
/usr/lib/qt4/bin/uic3 - from package: qt-devel

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

On Debian possible default full paths are:

/usr/bin/uic3 - from package: qtchooser
/usr/lib/x86_64-linux-gnu/qt4/bin/uic3 - from package: libqt4-dev-bin

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

Error in other languages:
uic3: bevel nie gevind nie
uic3: comandă negăsită
uic3: comando não encontrado
uic3: commande introuvable
uic3: command not found
uic3: käsku ei ole
uic3: không tìm thấy lệnh
uic3: komanda nerasta
uic3: Kommando nicht gefunden.
uic3: kommandot finns inte
uic3: komut yok
uic3: nie znaleziono polecenia
uic3: níor aimsíodh an t-ordú
uic3: no se encontró la orden
uic3: no s'ha trobat l'ordre
uic3: opdracht niet gevonden
uic3: parancs nem található
uic3: perintah tidak ditemukan
uic3: príkaz nenájdený
uic3: příkaz nenalezen
uic3: команда не найдена
uic3: командата не е открита
uic3: 命令找不到
uic3: コマンドが見つかりません