Upstream accepted my pullrequest to fix building on MacOSX 10.9, but has not created a tarball with new version number. I don't know when they accumulated enough new fixes or features to release a new tarball. Commit 89d8643c802f097c2d5a1a3c6f231dbea289da7a is 0.1.19 + macosx 10.9 fix, hence my usage of this release as 'stable'.