From e30f006b3c6fc9cc8065d43d75b5dc2e70e01023 Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Mon, 15 Nov 2021 21:06:16 +0000
Subject: [PATCH] cbqn-standalone: fix installPhase on darwin

---
 pkgs/development/interpreters/bqn/cbqn/default.nix | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/interpreters/bqn/cbqn/default.nix b/pkgs/development/interpreters/bqn/cbqn/default.nix
index 44d63ace738..4d872f0084e 100644
--- a/pkgs/development/interpreters/bqn/cbqn/default.nix
+++ b/pkgs/development/interpreters/bqn/cbqn/default.nix
@@ -52,8 +52,9 @@ stdenv.mkDerivation rec {
 
      mkdir -p $out/bin/
      cp BQN -t $out/bin/
-     ln -s $out/bin/BQN $out/bin/bqn
-     ln -s $out/bin/BQN $out/bin/cbqn
+     # note guard condition for case-insensitive filesystems
+     [ -e $out/bin/bqn ] || ln -s $out/bin/BQN $out/bin/bqn
+     [ -e $out/bin/cbqn ] || ln -s $out/bin/BQN $out/bin/cbqn
 
      runHook postInstall
   '';