>  Anybody have both installed currently?

Please share your configuration options in your gtk3-tqt-engine 
build script. I never have been able to build the package. The 
build always fails with this error:

gcc: error: /tde: No such file or directory

I believe the problem is in gtk3-tqt-engine/tdegtk/Makefile.am:1

INCLUDES= $(all_includes) $(KDE_INCLUDES)/tde

I believe $(KDE_INCLUDES) is never defined.

Darrell