From d2d7fbc431a06ec58f537921dc1b898167a69adc Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Sun, 15 Dec 2019 13:30:40 -0800
Subject: [PATCH] gzip: Don't depend on gzip being in $PATH

---
 pkgs/tools/compression/gzip/default.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/tools/compression/gzip/default.nix b/pkgs/tools/compression/gzip/default.nix
index 10cfa086860..65760a0b6cc 100644
--- a/pkgs/tools/compression/gzip/default.nix
+++ b/pkgs/tools/compression/gzip/default.nix
@@ -17,6 +17,15 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "SHELL=/bin/sh" "GREP=grep" ];
 
+  # Many gzip executables are shell scripts that depend upon other gzip
+  # executables being in $PATH.  Rather than try to re-write all the
+  # internal cross-references, just add $out/bin to PATH at the top of
+  # all the executables that are shell scripts.
+  preFixup = ''
+    sed -i '1{;/#!\/bin\/sh/aPATH="'$out'/bin:$PATH"
+    }' $out/bin/*
+  '';
+
   meta = {
     homepage = "https://www.gnu.org/software/gzip/";
     description = "GNU zip compression program";