In file included from /opt/trinity/include/kfileitem.h:31:0,
from /opt/trinity/include/konq_popupmenu.h:32,
from kdiff3plugin.h:24,
from kdiff3plugin.cpp:21: /opt/trinity/include/kfilemetainfo.h:1237:34: warning: type qualifiers ignored on function return type [-Wignored-qualifiers] kdiff3plugin.cpp: In constructor 'KDiff3Plugin::KDiff3Plugin(KonqPopupMenu*, const char*, const TQStringList&)': kdiff3plugin.cpp:153:27: error: 'addAction' was not declared in this scope
That looks familiar. Recently I pushed a patch to change occurrences in kdiff3 of tqAddAction to addAction:
http://www.trinitydesktop.org/patches/1332366465:3f02b2be383bb2ab233fe8885f0...
Try updating your kdiff3 sources or temporarily apply the patch.
Darrell