PDF files generated by Ghostscript contain timestamps and ids.

[[https://reproducible.debian.net/issues/pdf_created_by_ghostscript_issue.html|Known affected packages]]

= Detection =

[[attachment:pmw_4.28-1.debbindiff.html|Example debbindiff output]]

= Work-around =

None yet.

= Solution =

Patch: http://2k38.be/ghostscript_deb_build_timestamp.patch

------

UUIDs in `rdf:about` field is generated solely depending on current time. But the value of `/ID` varies even when `faketime` is used according to some preliminary tests.

 * This is in fact a ghostscript bug: their ID calculation uses their times(2) wrapper instead of their gettimeofday(2) wrapper to get the current time. In the function `pdf_compute_fileID`, replace `gp_get_usertime` with `gp_get_realtime`. With that change I get reproducible builds using faketime.