From b5610ed3f0cfdad9a6c7d542e963659f63e4f3a7 Mon Sep 17 00:00:00 2001
From: Matthew Bauer <mjbauer95@gmail.com>
Date: Sat, 14 Oct 2017 02:10:35 -0500
Subject: [PATCH] sqitch: fix on Darwin

Fixes #30389.
---
 pkgs/development/tools/misc/sqitch/default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/tools/misc/sqitch/default.nix b/pkgs/development/tools/misc/sqitch/default.nix
index b7b42b59653a..8328433a823f 100644
--- a/pkgs/development/tools/misc/sqitch/default.nix
+++ b/pkgs/development/tools/misc/sqitch/default.nix
@@ -11,7 +11,11 @@ stdenv.mkDerivation {
   installPhase = ''
     mkdir -p $out/bin
     for d in bin/sqitch etc lib share ; do
-      ln -s ${sqitchModule}/$d $out/$d
+      # make sure dest alreay exists before symlink
+      # this prevents installing a broken link into the path
+      if [ -e ${sqitchModule}/$d ]; then
+        ln -s ${sqitchModule}/$d $out/$d
+      fi
     done
   '';
   dontStrip = true;