From c55e8f9a0de2cbb2c7e99d091491351bc1f7ac2f Mon Sep 17 00:00:00 2001
From: Grimmauld <Grimmauld@grimmauld.de>
Date: Fri, 26 Sep 2025 12:09:26 +0200
Subject: [PATCH] fltk: use replace-fail for substitute

---
 pkgs/development/libraries/fltk/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/fltk/default.nix b/pkgs/development/libraries/fltk/default.nix
index 433c071a52d7..3181bb038ea8 100644
--- a/pkgs/development/libraries/fltk/default.nix
+++ b/pkgs/development/libraries/fltk/default.nix
@@ -185,7 +185,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   postFixup = ''
     substituteInPlace $out/bin/fltk-config \
-      --replace "/$out/" "/"
+      --replace-fail "/$out/" "/"
   '';
 
   meta = {