From 93a83a761a253d6c849ef8c70b9802860828b9a4 Mon Sep 17 00:00:00 2001
From: Christian Kampka <christian@kampka.net>
Date: Mon, 10 Jan 2022 20:45:19 +0100
Subject: [PATCH] libbpf: Fix musl build

See https://github.com/libbpf/libbpf/pull/41 for details.
---
 pkgs/os-specific/linux/libbpf/default.nix | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkgs/os-specific/linux/libbpf/default.nix b/pkgs/os-specific/linux/libbpf/default.nix
index daee83e61dbc..81e86fe77efc 100644
--- a/pkgs/os-specific/linux/libbpf/default.nix
+++ b/pkgs/os-specific/linux/libbpf/default.nix
@@ -21,12 +21,16 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-/MLPflnfooe7Wjy8M3CTowAi5oYpscruSkDsaVzhmYQ=";
   };
 
+  patches = [(fetchpatch {
+    url = "https://github.com/libbpf/libbpf/pull/41.diff";
+    sha256 = "sha256-pg5WARqh6z0nkTHMBhftxwdV2SyswC2lfaCXCpez0VA=";
+  })];
+
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ libelf zlib ];
 
-  sourceRoot = "source/src";
   enableParallelBuilding = true;
-  makeFlags = [ "PREFIX=$(out)" ];
+  makeFlags = [ "PREFIX=$(out)" "-C src" ];
 
   passthru.tests = {
     bpf = nixosTests.bpf;
@@ -34,7 +38,7 @@ stdenv.mkDerivation rec {
 
   postInstall = ''
     # install linux's libbpf-compatible linux/btf.h
-    install -Dm444 ../include/uapi/linux/btf.h -t $out/include/linux
+    install -Dm444 include/uapi/linux/btf.h -t $out/include/linux
   '';
 
   # FIXME: Multi-output requires some fixes to the way the pkg-config file is