Hi, This bug [1] is still present even with the version 1.1.1 of Julia. [1] http://issues.guix.gnu.org/issue/22304 --8<---------------cut here---------------start------------->8--- guix describe Generation 57 Nov 25 2019 14:26:15 (current) guix b5d4d5b repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: b5d4d5b9bcf267fddd02fcc14b88eac0bebf979f --8<---------------cut here---------------end--------------->8--- --8<---------------cut here---------------start------------->8--- guix build julia # populate the store with dependencies guix build julia --check -K --no-grafts [...] guix build: error: derivation `/gnu/store/xdy3jjz7dzg1lr231b8zbss8xn44ldjj-julia-1.1.1.drv' may not be deterministic: output `/gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1' differs from ‘/gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check’ --8<---------------cut here---------------end--------------->8--- --8<---------------cut here---------------start------------->8--- diff -r /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1 /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check Binary files /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1/lib/julia/sys.so and /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check/lib/julia/sys.so differ Binary files /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1/share/julia/test/depot/compiled/v1.1/Bar/HXSAn.ji and /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check/share/julia/test/depot/compiled/v1.1/Bar/HXSAn.ji differ Binary files /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1/share/julia/test/depot/compiled/v1.1/Baz/rONVA.ji and /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check/share/julia/test/depot/compiled/v1.1/Baz/rONVA.ji differ Binary files /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1/share/julia/test/depot/compiled/v1.1/Foo/MYb1d.ji and /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check/share/julia/test/depot/compiled/v1.1/Foo/MYb1d.ji differ Binary files /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1/share/julia/test/depot/compiled/v1.1/Foo/TeeT6.ji and /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check/share/julia/test/depot/compiled/v1.1/Foo/TeeT6.ji differ Binary files /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1/share/julia/test/depot/compiled/v1.1/Qux/YFfiR.ji and /gnu/store/s2vj70fgv4v4wq66dbi797ss15f8xd3b-julia-1.1.1-check/share/julia/test/depot/compiled/v1.1/Qux/YFfiR.ji differ --8<---------------cut here---------------end--------------->8--- Well, then I try to explore with diffoscope but hum? I do not do correctly because the resulting diff is 845MB ouch! All the best, simon