From 6e4ddbf9dff10ef795d1355c9e541dc9703b07d1 Mon Sep 17 00:00:00 2001
From: Gregor Lohaus <gregor.lohaus@8mylez.com>
Date: Thu, 28 May 2026 22:09:45 +0200
Subject: [PATCH] patch with perl

---
 flake.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/flake.nix b/flake.nix
index aad7cca..c2ff428 100644
--- a/flake.nix
+++ b/flake.nix
@@ -44,8 +44,13 @@
                 # Gluon Substrate hardcodes /usr/bin/pkg-config. Keep the
                 # replacement string the same byte length to avoid rewriting
                 # the Java class constant pool structure.
-                substituteInPlace com/gluonhq/substrate/util/linux/LinuxLinkerFlags.class \
-                  --replace-fail "/usr/bin/pkg-config" "/tmp/nix/pkg-config"
+                perl -0pi -e 's|/usr/bin/pkg-config|/tmp/nix/pkg-config|g' \
+                  com/gluonhq/substrate/util/linux/LinuxLinkerFlags.class
+
+                if grep -a -q "/usr/bin/pkg-config" com/gluonhq/substrate/util/linux/LinuxLinkerFlags.class; then
+                  echo "Failed to patch hardcoded pkg-config path in Substrate" >&2
+                  exit 1
+                fi
 
                 zip -qr "$out" .
               '';