R packages build non-deterministically: https://www.gnu.org/software/guix/packages/reproducibility.html
--8<---------------cut here---------------start------------->8--- $ wget -q -O - https://mirror.hydra.gnu.org/nar/imiwif0wn7dxcc7f4zdq09y1l1132pqj-r-zoo-1.7-14 | bunzip2 | guix archive -x one $ wget -q -O - https://bayfront.guixsd.org/nar/gzip/imiwif0wn7dxcc7f4zdq09y1l1132pqj-r-zoo-1.7-14 | gunzip | guix archive -x two $ diff -ru one two diff -ru one/site-library/zoo/DESCRIPTION two/site-library/zoo/DESCRIPTION --- one/site-library/zoo/DESCRIPTION 2017-02-01 10:49:49.700423133 +0100 +++ two/site-library/zoo/DESCRIPTION 2017-02-01 10:49:57.224462007 +0100 @@ -28,4 +28,4 @@ Maintainer: Achim Zeileis <[email protected]> Repository: CRAN Date/Publication: 2016-12-19 09:38:14 -Built: R 3.3.2; x86_64-unknown-linux-gnu; 2017-01-15 03:12:57 UTC; unix +Built: R 3.3.2; x86_64-unknown-linux-gnu; 2017-01-23 21:48:44 UTC; unix Binary files one/site-library/zoo/Meta/package.rds and two/site-library/zoo/Meta/package.rds differ --8<---------------cut here---------------end--------------->8--- First there’s a timestamp in ‘DESCRIPTION’ (this is discussed at <https://bugs.debian.org/782764>). The .rds differences seem less trivial but there’s apparently a fix at <https://bugs.debian.org/774031>. Ludo’.
