Looks like 1) the openbsd build does not define the primitive `primitiveGetCurrentWorkingDirectory` (see `OSPlatform>>currentWorkingDirectoryPathWithBuffer:`. 2) as a fallback, Pharo tries to get the working directory using `libc`'s `getcwd`, which is in Pharo asking for `'libc.so.6'`. Which version of `libc` do you have installed in your system?
Maybe for `getcwd` which is pretty standard we can not depend on `libc.so.6` but `libc.so`?