Add Mac OS X 10.6 problem
From <URL:http://cr.yp.to/distributors.html>:

2013.01.09: I hereby place the clockspeed package (in particular,
clockspeed-0.62.tar.gz, with MD5 checksum 425614174fcfe2ad42d22d3d02e2d567)
into the public domain. The package is no longer copyrighted.
Updated to latest stable: Removed custom do-build and do-install. Handled
automatically now. USE_LIBTOOL and GNU_CONFIGURE=yes; Fixed PLIST and
regenerated distinfo.