From ac8898e68150fc9cd2bc04ee6c4ef4d3005b8c27 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Wed, 7 Nov 2018 21:22:42 -0500
Subject: [PATCH] std.build.Builder: mutable env_map

---
 std/build.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/std/build.zig b/std/build.zig
index 1d90aa90e..855a71aa9 100644
--- a/std/build.zig
+++ b/std/build.zig
@@ -37,7 +37,7 @@ pub const Builder = struct.{
     invalid_user_input: bool,
     zig_exe: []const u8,
     default_step: *Step,
-    env_map: *const BufMap,
+    env_map: *BufMap,
     top_level_steps: ArrayList(*TopLevelStep),
     prefix: []const u8,
     search_prefixes: ArrayList([]const u8),