IDE`s issues

Hi guys. I have two problems:

  1. With QT Creator
    It cannot find QT version (seems like I have not set it to the ‘PATH’ variable if I`d be under windows). But I havent heard about that variable in linux and moreover,mu friends just installed the QT and its works…
  2. Netbeans
    Actually,I feel this is stupid but when I run NetBeans I only see bouncing icon of it in the right lower corner of cursor. What should I do?
    Thanks.

Any ideas guys? QT makes QMake error in every single launch.