I just realized that the io_lib included in the 1.6.0 tarball of
staden is different (newer) than the 1.9.0 io_lib release.
The symptom of using the io_lib 1.9.0 source code release with the
staden 1.6.0 tarball is that for instance trev fails with a floating
point exception when reading .ab1-files on amd64.
The difference is somewhat large (unified patch of apprx. 30KB).
Perhaps either the standalone io_lib source should be updated to match
the included one, or there should be a note about the discrepancy in
the build-instructions for staden?