From 6fea9e5902809220e12b50665072d70d8d507456 Mon Sep 17 00:00:00 2001
From: Graham Christensen <graham@grahamc.com>
Date: Wed, 29 Jan 2020 10:58:58 -0500
Subject: [PATCH] guile: disable parallel building for reproducibility

---
 pkgs/development/interpreters/guile/default.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/interpreters/guile/default.nix b/pkgs/development/interpreters/guile/default.nix
index fce94ecc846f..fac3d6b6fe6d 100644
--- a/pkgs/development/interpreters/guile/default.nix
+++ b/pkgs/development/interpreters/guile/default.nix
@@ -38,7 +38,13 @@
     libtool libunistring
   ];
 
-  enableParallelBuilding = true;
+  # According to Bernhard M. Wiedemann <bwiedemann suse de> on
+  # #reproducible-builds on irc.oftc.net, (2020-01-29): they had to
+  # build Guile without parallel builds to make it reproducible.
+  #
+  # re: https://issues.guix.gnu.org/issue/20272
+  # re: https://build.opensuse.org/request/show/732638
+  enableParallelBuilding = false;
 
   patches = [
     ./eai_system.patch
@@ -109,4 +115,3 @@
     '';
   };
 })
-