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-rw-r--r--gnu/packages/gnuzilla.scm4
1 files changed, 4 insertions, 0 deletions
diff --git a/gnu/packages/gnuzilla.scm b/gnu/packages/gnuzilla.scm
index a0819b809a..388c5db642 100644
--- a/gnu/packages/gnuzilla.scm
+++ b/gnu/packages/gnuzilla.scm
@@ -268,6 +268,10 @@ in C/C++.")
                                (string-append "LDFLAGS=-Wl,-rpath="
                                               (assoc-ref %outputs "out")
                                               "/lib"))
+       ;; Use fixed timestamps for reproducibility.
+       #:make-flags '("SH_DATE='1970-01-01 00:00:01'"
+                      ;; This is epoch 1 in microseconds.
+                      "SH_NOW=100000")
        #:phases (modify-phases %standard-phases
                   (add-before 'configure 'chdir
                     (lambda _ (chdir "nspr") #t)))))