There's ext/IPC/SysV/SysV.pm and there's ext/IPC/SysV/lib/IPC/SysV.pm. The former looks like a left over from previous versions of IPC::SysV and should be deleted. $ cat .patch 34572 $ uname -a Darwin windhund.schwern.org 8.11.1 Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386 i386 i386 MacBook1,1 Darwin ext/IPC/SysV/t/ipcsysv..........................IPC::SysV object version 2.00 does not match bootstrap parameter 1.05 at ../lib/DynaLoader.pm line 253. Compilation failed in require at ../ext/IPC/SysV/t/ipcsysv.t line 43. BEGIN failed--compilation aborted at ../ext/IPC/SysV/t/ipcsysv.t line 43. FAILED--no leader found ext/IPC/SysV/t/msg..............................IPC::SysV object version 2.00 does not match bootstrap parameter 1.05 at ../lib/DynaLoader.pm line 253. Compilation failed in require at ../ext/IPC/SysV/t/msg.t line 37. BEGIN failed--compilation aborted at ../ext/IPC/SysV/t/msg.t line 37. FAILED--no leader found ext/IPC/SysV/t/podcov...........................skipped ext/IPC/SysV/t/pod..............................skipped ext/IPC/SysV/t/sem..............................IPC::SysV object version 2.00 does not match bootstrap parameter 1.05 at ../lib/DynaLoader.pm line 253. Compilation failed in require at ../ext/IPC/SysV/t/sem.t line 48. BEGIN failed--compilation aborted at ../ext/IPC/SysV/t/sem.t line 48. FAILED--no leader found ext/IPC/SysV/t/shm..............................IPC::SysV object version 2.00 does not match bootstrap parameter 1.05 at ../lib/DynaLoader.pm line 253. Compilation failed in require at ../ext/IPC/SysV/t/shm.t line 35. BEGIN failed--compilation aborted at ../ext/IPC/SysV/t/shm.t line 35. FAILED--no leader found -- "Clutter and overload are not an attribute of information, they are failures of design" -- Edward TufteThread Next