From 79cc492cebc8fc1d1cc5f2fc9658e8ea27b751b2 Mon Sep 17 00:00:00 2001
From: Mauricio Collares <mauricio@collares.org>
Date: Thu, 7 Apr 2022 14:06:18 +0200
Subject: [PATCH] sage: set CXXFLAGS to match CFLAGS in sage-env

---
 pkgs/applications/science/math/sage/sage-env.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/applications/science/math/sage/sage-env.nix b/pkgs/applications/science/math/sage/sage-env.nix
index e680c0c3b22d..cdff1e8477ab 100644
--- a/pkgs/applications/science/math/sage/sage-env.nix
+++ b/pkgs/applications/science/math/sage/sage-env.nix
@@ -151,6 +151,7 @@ writeTextFile rec {
 
     # needed for cython
     export CC='${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc'
+    export CXX='${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++'
     # cython needs to find these libraries, otherwise will fail with `ld: cannot find -lflint` or similar
     export LDFLAGS='${
       lib.concatStringsSep " " (map (pkg: "-L${pkg}/lib") [
@@ -178,6 +179,7 @@ writeTextFile rec {
         mpfr.dev
       ])
     }'
+    export CXXFLAGS=$CFLAGS
 
     export SAGE_LIB='${sagelib}/${python3.sitePackages}'