From 59067f0f587f75908c4f990bcbab29340c7f7652 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 6 Aug 2020 11:40:41 +0200
Subject: [PATCH] repl.cc: Check for HAVE_BOEHMGC

Fixes #3906.
---
 src/nix/repl.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/nix/repl.cc b/src/nix/repl.cc
index fb9050d0d..c3c9e54a8 100644
--- a/src/nix/repl.cc
+++ b/src/nix/repl.cc
@@ -33,12 +33,17 @@ extern "C" {
 #include "command.hh"
 #include "finally.hh"
 
+#if HAVE_BOEHMGC
 #define GC_INCLUDE_NEW
 #include <gc/gc_cpp.h>
+#endif
 
 namespace nix {
 
-struct NixRepl : gc
+struct NixRepl
+    #if HAVE_BOEHMGC
+    : gc
+    #endif
 {
     string curDir;
     std::unique_ptr<EvalState> state;