From c9fa03136ad26fab9c5d4d62c57fc26e2d5dc9e5 Mon Sep 17 00:00:00 2001
From: Jonathan Ringer <jonringer117@gmail.com>
Date: Fri, 11 Feb 2022 10:06:55 -0800
Subject: [PATCH] or-tools: disable parallel-building

protobuf generation is not thread safe

```
       > ./ortools/scheduling/rcpsp_parser.h:24:10: fatal error: ortools/scheduling/rcpsp.pb.h: No such file or directory
       >    24 | #include "ortools/scheduling/rcpsp.pb.h"
```
---
 pkgs/development/libraries/science/math/or-tools/default.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/science/math/or-tools/default.nix b/pkgs/development/libraries/science/math/or-tools/default.nix
index ca3e4a243691..20978e31cff1 100644
--- a/pkgs/development/libraries/science/math/or-tools/default.nix
+++ b/pkgs/development/libraries/science/math/or-tools/default.nix
@@ -77,7 +77,8 @@ stdenv.mkDerivation rec {
     (cd temp_python/ortools; PYTHONPATH="$python/${python.sitePackages}:$PYTHONPATH" python setup.py install '--prefix=$python')
   '';
 
-  enableParallelBuilding = true;
+  # protobuf generation is not thread safe
+  enableParallelBuilding = false;
 
   nativeBuildInputs = [
     cmake