From 88c7b4c7fee42c1ae5167fd1e7806d600e4451e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Forsman?= <bjorn.forsman@gmail.com>
Date: Tue, 3 Dec 2013 16:58:49 +0100
Subject: [PATCH] Fix bug introduced in previous commit

When building e.g. perl for the first time there is no perl in PATH yet,
so command -v perl will fail.

This brings back the previous behaviour of silently not patching
shebangs for which there is no available command in PATH.
---
 pkgs/stdenv/generic/setup.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 3cc84c9db5e..1ed905db363 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -685,14 +685,14 @@ patchShebangs() {
                 echo "unsupported interpreter directive \"$oldInterpreterLine\" (set dontPatchShebangs=1 and handle shebang patching yourself)"
                 exit 1
             fi
-            newPath="$(command -v "$arg0")"
+            newPath="$(command -v "$arg0" || true)"
         else
             if [ "$oldPath" = "" ]; then
                 # If no interpreter is specified linux will use /bin/sh. Set
                 # oldpath="/bin/sh" so that we get /nix/store/.../sh.
                 oldPath="/bin/sh"
             fi
-            newPath="$(command -v "$(basename "$oldPath")")"
+            newPath="$(command -v "$(basename "$oldPath")" || true)"
             args="$arg0 $args"
         fi