The perl plugin modules for pidgin are built without specifying they have dependencies on libglib-2.0. I have also reported this upstream as issue #5744 I am attaching a patch that corrects the two Makefile.PL files.
Created attachment 152443 [details, diff] Patch to correct perl module dependencies This corrects the construction of the perl modules so that the shared objects created contain information indicating they have a runtime dependency on libglib-2.0.so
Upstream closed ticket. So we do. If this is still an issue reopen and answer upstream question.