1 files changed, 10 insertions, 1 deletions
diff --git a/gnu/packages/mono.scm b/gnu/packages/mono.scm
index 8ab449dd8e..17f90fe30a 100644
--- a/gnu/packages/mono.scm
+++ b/gnu/packages/mono.scm
@@ -41,7 +41,8 @@
                     ".tar.bz2"))
               (sha256
                (base32
-                "0jibyvyv2jy8dq5ij0j00iq3v74r0y90dcjc3dkspcfbnn37cphn"))))
+                "0jibyvyv2jy8dq5ij0j00iq3v74r0y90dcjc3dkspcfbnn37cphn"))
+              (patches (search-patches "mono-mdoc-timestamping.patch"))))
     (build-system gnu-build-system)
     (native-inputs
      `(("gettext" ,gettext-minimal)
@@ -52,10 +53,18 @@
     (arguments
      `(#:phases
        (modify-phases %standard-phases
+         (add-after 'unpack 'make-reproducible
+           (lambda _
+             (substitute* "mono/mini/Makefile.in"
+              (("build_date = [^;]*;")
+               "build_date = (void*) 0;"))
+             #t))
          (add-after 'unpack 'set-env
            (lambda _ ;;* (#:key inputs #:allow-other-keys)
              ;; all tests under mcs/class fail trying to access $HOME
              (setenv "HOME" "/tmp")
+             ;; ZIP files have "DOS time" which starts in Jan 1980.
+             (setenv "SOURCE_DATE_EPOCH" "315532800")
              #t))
          (add-after 'unpack 'fix-includes
            (lambda _