hearnet compilation fails with g++, pkg-config, and jack.pc

[ԜаӀtеr Ⅼарсһуnѕkі]

I realize hearnet is not Canonically-supported :D but suffice it to say, in trying to compile it, I discovered an apparent problem with jack.pc. I tried to troubleshoot this with the developer but had no luck. Long story short, the error shown by g++ suggests missing symbols in the libraries but nm shows the symbols are there. Also, without pkg-config, the code compiles fine. It seems the only logical conclusion is that there is something amiss with jack.pc. Here's the conversation with the hearnet developer:
https://github.com/fugalh/hearnet/issues/1#issuecomment-2908631

Lubuntu 11.10
libjack-jackd2-dev:
  Installed: 1.9.7~dfsg-1ubuntu2
  Candidate: 1.9.7~dfsg-1ubuntu2

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libjack-jackd2-dev 1.9.7~dfsg-1ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Thu Dec 1 21:56:11 2011
EcryptfsInUse: Yes
InstallationMedia: Lubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: jackd2
UpgradeStatus: No upgrade log present (probably fresh install)