[Interest] Qt5 font rendering is wrong

[Nikos Chantziaras]

When building apps against Qt5 (current Git), the font rendering is off. 
  It doesn't seem to obey my system's font configuration, like Qt4 does. 
  Fonts appear thin and washed out.

This is on Linux with KDE 4.9.  Am I missing some configuration option? 
  I did enable the system freetype and fontconfig configure options.

(Also, all widgets look like Windows 95 and nothing like KDE widgets, 
but I guess that's a separate problem.)