According to Paul B. Henson <henson@acm.org>:
The correct configuration for Solaris is to compile DCE-perl with *only* -ldce, and then recompile perl itself including at least the following libraries:
-ldce -lsocket -lnsl -lthread -lm
FYI, for Digital Unix 4.0, you only need '-ldce'.
For Digital Unix 3.2, you need '-ldce -lpthreads -lmach -lc_r'.