--enable-tde. TDEDIR and friends are the appropriate environment variables to use.

I downloaded the LO sources and walked through the patch stored in 'thirdparty'. As far as I can tell, the patch no longer is needed. Am I correct?

Seems all that is needed is --enable-tde and as a precaution, in the build script ensure $TDEDIR, $QTDIR, $QTINC, and $QTLIB are exported to the build environment. Am I correct?

There also is a --enable-tdeab option to ensure Trinity addressbook support, but I did not look into that deeply. The option might be enabled by default when --enable-tde is enabled.

For a reference point, how long does LO take to compile on your systems?

Darrell