From 90e26d392c7ac4c2a69163f881f73916e6fba3c1 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Thu, 6 Nov 2003 15:24:31 +0000
Subject: [PATCH] * Allow null in derivation bindings.

---
 src/fix-ng/primops.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/fix-ng/primops.cc b/src/fix-ng/primops.cc
index df5747edd4..fb923ed46e 100644
--- a/src/fix-ng/primops.cc
+++ b/src/fix-ng/primops.cc
@@ -114,6 +114,8 @@ static string processBinding(EvalState & state, Expr e, NixExpr & ne)
         }
 	return s;
     }
+
+    if (ATmatch(e, "Null")) return "";
     
     throw badTerm("invalid derivation binding", e);
 }