From a478a757255e118dc637820886d8feae58dc049e Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sun, 24 Oct 2021 19:02:45 +0100
Subject: [PATCH] libb64: enable parallel builds

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>
---
 pkgs/development/libraries/libb64/default.nix | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/libb64/default.nix b/pkgs/development/libraries/libb64/default.nix
index 605faaebf696..81ba4263a1d6 100644
--- a/pkgs/development/libraries/libb64/default.nix
+++ b/pkgs/development/libraries/libb64/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub }:
+{ lib, stdenv, fetchFromGitHub, fetchpatch }:
 
 stdenv.mkDerivation rec {
   pname = "libb64";
@@ -11,6 +11,18 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-9loDftr769qnIi00MueO86kjha2EiG9pnCLogp0Iq3c=";
   };
 
+  patches = [
+    # Fix parallel build failure: https://github.com/libb64/libb64/pull/9
+    #  make[1]: *** No rule to make target 'libb64.a', needed by 'c-example1'.  Stop.
+    (fetchpatch {
+      name = "parallel-make.patch";
+      url = "https://github.com/libb64/libb64/commit/4fe47c052e9123da8f751545deb48be08c3411f6.patch";
+      sha256 = "18b3np3gpyzimqmk6001riqv5n70wfbclky6zzsrvj5zl1dj4ljf";
+    })
+  ];
+
+  enableParallelBuilding = true;
+
   installPhase = ''
     mkdir -p $out $out/lib $out/bin $out/include
     cp -r include/* $out/include/