From 758e81662f086a29079c9702afa1f6cef3f1d36c Mon Sep 17 00:00:00 2001
From: "R. RyanTM" <ryantm-bot@ryantm.com>
Date: Mon, 6 Apr 2020 11:46:40 +0000
Subject: [PATCH 1/2] petsc: 3.12.4 -> 3.13.0

---
 pkgs/development/libraries/science/math/petsc/default.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/science/math/petsc/default.nix b/pkgs/development/libraries/science/math/petsc/default.nix
index 492ad63f27b..7b0b500d12d 100644
--- a/pkgs/development/libraries/science/math/petsc/default.nix
+++ b/pkgs/development/libraries/science/math/petsc/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "petsc";
-  version = "3.12.4";
+  version = "3.13.0";
 
   src = fetchurl {
     url = "http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-${version}.tar.gz";
-    sha256 = "1hw4f12v2xwrs37gjh83dbixhg0yxandqx7s7k5vlfx91l9l3aan";
+    sha256 = "0943bydmsq3sjwj3rxhb8hx58b1fm8vymny731557fs10g5zfbyz";
   };
 
   nativeBuildInputs = [ blas gfortran.cc.lib liblapack python ];

From ad15e4e8a0beb93ba5b79d64c9cd8b2ac25fde88 Mon Sep 17 00:00:00 2001
From: Mario Rodas <marsam@users.noreply.github.com>
Date: Mon, 6 Apr 2020 12:00:00 +0000
Subject: [PATCH 2/2] petsc: fix build on darwin

---
 pkgs/development/libraries/science/math/petsc/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/science/math/petsc/default.nix b/pkgs/development/libraries/science/math/petsc/default.nix
index 7b0b500d12d..911f0a1cf89 100644
--- a/pkgs/development/libraries/science/math/petsc/default.nix
+++ b/pkgs/development/libraries/science/math/petsc/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     configureFlagsArray=(
       $configureFlagsArray
       "--CC=$CC"
-      "--with-cxx=g++"
+      "--with-cxx=$CXX"
       "--with-fc=0"
       "--with-mpi=0"
       "--with-blas-lib=[${blas}/lib/libblas.a,${gfortran.cc.lib}/lib/libgfortran.a]"