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: ./PaxHeaders.22371/WWW-WebKit2-0.123,./PaxHeaders.22371/WWW-WebKit2-0.123,WWW-WebKit2-0.123/PaxHeaders.22371/t,WWW-WebKit2-0.123/PaxHeaders.22371/t,WWW-WebKit2-0.123/t/PaxHeaders.22371/navigator.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/navigator.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/test,WWW-WebKit2-0.123/t/PaxHeaders.22371/test,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/keyboard.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/keyboard.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/events.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/events.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/load.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/load.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/console_error.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/console_error.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/drag_and_drop.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/drag_and_drop.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/eval.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/eval.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/print.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/print.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/attribute.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/attribute.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/confirm.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/confirm.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/ordered.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/ordered.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/mouse_input.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/mouse_input.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/locator.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/locator.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/type.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/type.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/prompt.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/prompt.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/utf8.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/utf8.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/select.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/select.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/delete.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/delete.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/key_press.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/key_press.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/unload.html,WWW-WebKit2-0.123/t/test/PaxHeaders.22371/unload.html,WWW-WebKit2-0.123/t/PaxHeaders.22371/keyboard.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/keyboard.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/mouse.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/mouse.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/locator.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/locator.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/logging.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/logging.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/inspector.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/inspector.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/events.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/events.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/drag_and_drop.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/drag_and_drop.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/01load.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/01load.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/drag_and_drop_mouse.t,WWW-WebKit2-0.123/t/PaxHeaders.22371/drag_and_drop_mouse.t,WWW-WebKit2-0.123/PaxHeaders.22371/lib,WWW-WebKit2-0.123/PaxHeaders.22371/lib,WWW-WebKit2-0.123/lib/PaxHeaders.22371/WWW,WWW-WebKit2-0.123/lib/PaxHeaders.22371/WWW,WWW-WebKit2-0.123/lib/WWW/PaxHeaders.22371/WebKit2,WWW-WebKit2-0.123/lib/WWW/PaxHeaders.22371/WebKit2,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Proxy.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Proxy.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Locator.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Locator.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/KeyboardInput.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/KeyboardInput.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/MouseInput.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/MouseInput.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Settings.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Settings.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Events.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Events.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Navigator.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Navigator.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Cookies.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Cookies.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Inspector.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/Inspector.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/LocatorCSS.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/LocatorCSS.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/MouseInput,WWW-WebKit2-0.123/lib/WWW/WebKit2/PaxHeaders.22371/MouseInput,WWW-WebKit2-0.123/lib/WWW/WebKit2/MouseInput/PaxHeaders.22371/DragAndDropSimulator.pm,WWW-WebKit2-0.123/lib/WWW/WebKit2/MouseInput/PaxHeaders.22371/DragAndDropSimulator.pm,WWW-WebKit2-0.123/lib/WWW/PaxHeaders.22371/WebKit2.pm,WWW-WebKit2-0.123/lib/WWW/PaxHeaders.22371/WebKit2.pm,WWW-WebKit2-0.123/PaxHeaders.22371/Changes,WWW-WebKit2-0.123/PaxHeaders.22371/Changes,WWW-WebKit2-0.123/PaxHeaders.22371/LICENSE,WWW-WebKit2-0.123/PaxHeaders.22371/LICENSE,WWW-WebKit2-0.123/PaxHeaders.22371/README.md,WWW-WebKit2-0.123/PaxHeaders.22371/README.md,WWW-WebKit2-0.123/PaxHeaders.22371/Makefile.PL,WWW-WebKit2-0.123/PaxHeaders.22371/Makefile.PL,WWW-WebKit2-0.123/PaxHeaders.22371/MANIFEST,WWW-WebKit2-0.123/PaxHeaders.22371/MANIFEST,WWW-WebKit2-0.123/PaxHeaders.22371/README,WWW-WebKit2-0.123/PaxHeaders.22371/README,WWW-WebKit2-0.123/PaxHeaders.22371/META.yml,WWW-WebKit2-0.123/PaxHeaders.22371/META.yml,WWW-WebKit2-0.123/PaxHeaders.22371/META.json,WWW-WebKit2-0.123/PaxHeaders.22371/META.json