example udfs run error

[bakey]

When I try to build the example udfs and run it , I got error:
LLVM ERROR: Program used external function 'add_five' which could not be resolved!
I figure that should be lack the -rdynamic in the gcc flags.
I want to submit a PR to fix that.
But I found that still exist 2 unmerge PR. I want to know who is maintaining this project and what is the PR standard?