I have reason to believe that the library you are after already exists in the
ppl.tcz extension.
And here is how you could have found that out for yourself:
tc@box:~$ provides.sh libppl_c.so
tc@box:~$ cat info.lst
ppl.tcz
tc@box:~$ tce-fetch.sh ppl.tcz.list
tc@box:~$ grep libppl_c.so ppl.tcz.list
usr/local/lib/libppl_c.so
usr/local/lib/libppl_c.so.2
usr/local/lib/libppl_c.so.2.1.0
tc@box:~$
All that lookup works of course also via the 'appbrowser'. But it's much easier for me to show a few CLI commands (which are pretty much what 'appbrowser' would execute "under the covers"), instead of writing a lengthy story of how to achieve this via the GUI. OTOH the
wiki mentions this briefly.