From fd53244bec9dfa9f28bcb9074decea80ec10e700 Mon Sep 17 00:00:00 2001
From: K900 <me@0upti.me>
Date: Sun, 21 Aug 2022 11:07:58 +0300
Subject: [PATCH] linux: fix builds for old LTS kernels

---
 pkgs/os-specific/linux/kernel/manual-config.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/os-specific/linux/kernel/manual-config.nix b/pkgs/os-specific/linux/kernel/manual-config.nix
index 2fcd39bf596..4780c959315 100644
--- a/pkgs/os-specific/linux/kernel/manual-config.nix
+++ b/pkgs/os-specific/linux/kernel/manual-config.nix
@@ -108,6 +108,10 @@ let
       prePatch = ''
         sed -i Makefile -e 's|= depmod|= ${buildPackages.kmod}/bin/depmod|'
 
+        # fixup for pre-5.4 kernels using the $(cd $foo && /bin/pwd) pattern
+        # FIXME: remove when no longer needed
+        substituteInPlace Makefile tools/scripts/Makefile.include --replace /bin/pwd pwd
+
         # Don't include a (random) NT_GNU_BUILD_ID, to make the build more deterministic.
         # This way kernels can be bit-by-bit reproducible depending on settings
         # (e.g. MODULE_SIG and SECURITY_LOCKDOWN_LSM need to be disabled).