From 844bd5374057404ecea6cfbf3b92b89507240432 Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Tue, 8 Jan 2019 00:16:45 -0600
Subject: [PATCH] bash5: enable parallel building optimistically

Works for me and they've had quite some time to fix it ;).
---
 pkgs/shells/bash/5.0.nix | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/pkgs/shells/bash/5.0.nix b/pkgs/shells/bash/5.0.nix
index e747511be59..e36259c2496 100644
--- a/pkgs/shells/bash/5.0.nix
+++ b/pkgs/shells/bash/5.0.nix
@@ -78,9 +78,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = optional interactive readline80;
 
-  # Bash randomly fails to build because of a recursive invocation to
-  # build `version.h'.
-  enableParallelBuilding = false;
+  enableParallelBuilding = true;
 
   makeFlags = optional stdenv.hostPlatform.isCygwin [
     "LOCAL_LDFLAGS=-Wl,--export-all,--out-implib,libbash.dll.a"