If you use Mac OS X >= 10.6, use gnu tar (/usr/bin/gnutar) to avoid PAX headers. It's also important to rename (shorten) long file names (>= 100 characters) in the distribution.
Error: PaxHeader/Sys-RunUntil-0.06,PaxHeader/Sys-RunUntil-0.06,Sys-RunUntil-0.06/PaxHeader/CHANGELOG,Sys-RunUntil-0.06/PaxHeader/CHANGELOG,Sys-RunUntil-0.06/PaxHeader/MANIFEST,Sys-RunUntil-0.06/PaxHeader/MANIFEST,Sys-RunUntil-0.06/PaxHeader/t,Sys-RunUntil-0.06/PaxHeader/t,Sys-RunUntil-0.06/PaxHeader/README,Sys-RunUntil-0.06/PaxHeader/README,Sys-RunUntil-0.06/PaxHeader/TODO,Sys-RunUntil-0.06/PaxHeader/TODO,Sys-RunUntil-0.06/PaxHeader/VERSION,Sys-RunUntil-0.06/PaxHeader/VERSION,Sys-RunUntil-0.06/PaxHeader/META.yml,Sys-RunUntil-0.06/PaxHeader/META.yml,Sys-RunUntil-0.06/PaxHeader/lib,Sys-RunUntil-0.06/PaxHeader/lib,Sys-RunUntil-0.06/PaxHeader/Makefile.PL,Sys-RunUntil-0.06/PaxHeader/Makefile.PL,Sys-RunUntil-0.06/PaxHeader/META.json,Sys-RunUntil-0.06/PaxHeader/META.json,Sys-RunUntil-0.06/lib/PaxHeader/Sys,Sys-RunUntil-0.06/lib/PaxHeader/Sys,Sys-RunUntil-0.06/lib/Sys/PaxHeader/RunUntil.pm,Sys-RunUntil-0.06/lib/Sys/PaxHeader/RunUntil.pm,Sys-RunUntil-0.06/t/PaxHeader/RunUntil.t,Sys-RunUntil-0.06/t/PaxHeader/RunUntil.t