From 276e38a1bb8ab19aed754977523bcc6b8161dc0c Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 17 Sep 2015 16:54:07 +0200
Subject: [PATCH] patchShebangs: Ignore outputs that don't exist yet

---
 pkgs/build-support/setup-hooks/patch-shebangs.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/build-support/setup-hooks/patch-shebangs.sh b/pkgs/build-support/setup-hooks/patch-shebangs.sh
index 152755992f6..9d8cd0217a5 100644
--- a/pkgs/build-support/setup-hooks/patch-shebangs.sh
+++ b/pkgs/build-support/setup-hooks/patch-shebangs.sh
@@ -5,7 +5,7 @@
 # rewritten to /nix/store/<hash>/bin/python.  Interpreters that are
 # already in the store are left untouched.
 
-fixupOutputHooks+=('if [ -z "$dontPatchShebangs" ]; then patchShebangs "$prefix"; fi')
+fixupOutputHooks+=('if [ -z "$dontPatchShebangs" -a -e "$prefix" ]; then patchShebangs "$prefix"; fi')
 
 patchShebangs() {
     local dir="$1"