Difference between revisions of "QT4"

Revision as of 12:25, 18 May 2008

QT is a GUI software development toolkit used by MythTV as a framework for development.

Prior to version 0.22, MythTV was built using QT3. 0.22 will require QT version 4.3 as a minimum.

Most Linux distributions include a package manager, like yum which can install these libraries, and for those that compile from source, the development libraries. A typical command might be

yum install qt4 qt4-devel

Please refer to your OS specific instructions for installing packages or you can get it direct from the source

Isaac offers these suggestions on the mythtv-dev mailing list for those updating

A few tips for those updating:

- make sure you have the qt4 mysql library installed.

- do a distclean first, then remove any stray Makefiles that didn't get
removed by the distclean.  It may use the wrong qmake (ie, qt3's qmake)
otherwise.  I just did a 'find . -name "Makefile" -exec rm -f {} \;' from the
top level checkout dirs to fix this.

- The database updates will take a couple minutes to churn through and convert
the DB over to the new format.

Further notes from my experience. 1. Qt4.4 works - the min is 4.3, rather than requiring exactly 4.3. The lists don't make this clear, many distros now have 4.4. 2. Some people are getting a problem with a segfault after the scaling screen comes up. Delete all myth libs and bin files, then rebuild, things come good. 3. OpenGL painter giving problems on many setting screens, use qt instead (may have to update db directly if you can't get to settings pages - table name is settings).

Temporary note for upgrading to QT4 from QT3 on Ubuntu

NOTE: I will update this as I go thru the process. This is a placeholder.

apt-get install libqt4-core libqt4-debug libqt4-dev libqt4-gui libqt4-sql qt4-dev-tools qt4-qtconfig qt4-doc  qt4-designer