From 07e1ae54a65e0a6359cb7ded62cad0e9bb8f2fcd Mon Sep 17 00:00:00 2001
From: Orivej Desh <orivej@gmx.fr>
Date: Mon, 4 Jun 2018 06:46:30 +0000
Subject: [PATCH] plotutils: fix parallel building

E.g. https://hydra.nixos.org/build/75429322:

     b_closepl.c:21:10: fatal error: xmi.h: No such file or directory
     make[2]: *** [Makefile:958: b_closepl.lo] Error 1
     make[2]: Leaving directory '/build/plotutils-2.6/libplot'
---
 pkgs/tools/graphics/plotutils/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/tools/graphics/plotutils/default.nix b/pkgs/tools/graphics/plotutils/default.nix
index 85685e0b048..780e09ee91c 100644
--- a/pkgs/tools/graphics/plotutils/default.nix
+++ b/pkgs/tools/graphics/plotutils/default.nix
@@ -17,6 +17,11 @@ stdenv.mkDerivation rec {
   buildInputs = [ libpng ];
   patches = map fetchurl (import ./debian-patches.nix);
 
+  preBuild = ''
+    # Fix parallel building.
+    make -C libplot xmi.h
+  '';
+
   configureFlags = "--enable-libplotter"; # required for pstoedit
 
   hardeningDisable = [ "format" ];