From bdd4646338da296fdf3a8f9dc3cf5aff1dafa163 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 8 Mar 2013 01:24:59 +0100
Subject: Revert "Prevent config.h from being clobbered"

This reverts commit 28bba8c44f484eae38e8a15dcec73cfa999156f6.
---
 src/libexpr/eval.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/libexpr/eval.cc')

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 676dd3ac461a..a1613a4205b4 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -966,7 +966,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
            since paths are copied when they are used in a derivation),
            and none of the strings are allowed to have contexts. */
         if (first) {
-            isPath = vStr.type == tPath;
+            isPath = !forceString && vStr.type == tPath;
             first = false;
         }
 
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