From 4a4a1ede98b70d091385777acbdd6b7ba9dbecc8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karen/=E3=81=82=E3=81=91=E3=81=BF?= <karen@akemi.ai>
Date: Fri, 15 Oct 2021 14:27:06 -0700
Subject: [PATCH] aria2: Add missing `ENV.cxx11` in the install block so the
 `-std=c++11` flag will be correctly passed on to GCC.
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This depends on changes to ENV (superenv / stdenv) made in PR #767.

Interestingly, aria2 actually builds fine even without `ENV.cxx11` being present… but including it is a much better / "proper" way to do this.
---
 Library/Formula/aria2.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Library/Formula/aria2.rb b/Library/Formula/aria2.rb
index 87271ad2316..0e455558044 100644
--- a/Library/Formula/aria2.rb
+++ b/Library/Formula/aria2.rb
@@ -21,6 +21,13 @@ class Aria2 < Formula
   needs :cxx11
 
   def install
+    if MacOS.version > :tiger
+      # Specifying -std=c++11 (which is what ENV.cxx11 does) on 10.4.x with gcc-7 causes the build to fail.
+      # For some reason, omitting this flag allows aria2 to successfully build and run on OS X 10.4.x.
+      # TODO: Verify if this behaviour occurs with other versions of GCC that support C++11 (such as gcc-6 or gcc-5).
+      ENV.cxx11
+    end
+
     args = %W[
       --disable-dependency-tracking
       --prefix=#{prefix}