Fix fetchurl of executable file

Pointed out by @cstrahan, thanks!

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/builtins.cc b/src/libstore/builtins.cc
index 97d6cb943..25e2e7df3 100644
--- a/src/libstore/builtins.cc
+++ b/src/libstore/builtins.cc
@@ -14,7 +14,7 @@ void builtinFetchurl(const BasicDerivation & drv)
     if (out == drv.env.end()) throw Error("attribute ‘url’ missing");
     writeFile(out->second, data.data);
 
-    auto executable = drv.env.find("out");
+    auto executable = drv.env.find("executable");
     if (executable != drv.env.end() && executable->second == "1") {
         if (chmod(out->second.c_str(), 0755) == -1)
             throw SysError(format("making ‘%1%’ executable") % out->second);