I need help. I gave me the following prompt when compiling QT6.0, so that I couldn't do the following work.

[MyDream]

• cd qtbase
• /opt/Qt/qt-everywhere-src-6.1.0-alpha/qtbase/configure -top-level
  /opt/Qt/qt-everywhere-src-6.1.0-alpha/qtbase/configure: 299: cmake: not found

However, this file does exist

[SGaist]

Hi and welcome to devnet,

Do you have cmake installed and if so which version ?

That said, /opt is usually not user writable so you should do an out of source build from somewhere you can like your home folder (doing it as root is a bad idea).