Use the supplied copy of decus cpp or get your own from 
comp.sources.unix/volume01/cpp

Apply the patch to the decus source tree.
This should be something like:

patch < diff-0.11.tpp
mv makefile.tpp decus/Makefile
cd decus
vi Makefile
make

There is no configure so you will have to modify the makefile yourself,
it is pretty generic so you should not have to much work to do.

Move tpp to someplace in your PATH.

Good luck.
