From 7a1b715d55912e8f84ba8e0325ef63bb120af7da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Sat, 31 Aug 2024 18:27:21 +0200
Subject: [PATCH] gnu: perf: Properly detect libtraceevent.
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* gnu/packages/linux.scm (perf)[arguments]: In ‘configure’ phase, modify
‘Makefile.config’ to leave ‘PKG_CONFIG_PATH’ unchanged.

Change-Id: I7b6017200ed9b28c367182b252ef694f6b2ce73b
---
 gnu/packages/linux.scm | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm
index 88b13a0d18..3ef6479377 100644
--- a/gnu/packages/linux.scm
+++ b/gnu/packages/linux.scm
@@ -5239,6 +5239,13 @@ (define-public perf
              (setenv "SHELL_PATH" (which "bash"))
              (chdir "tools/perf")
 
+             ;; In Linux 6.10.6, 'Makefile.config' overrides PKG_CONFIG_PATH
+             ;; when looking for libtraceevent and thus fails to find it.
+             ;; Remove that.
+             (substitute* "Makefile.config"
+               (("PKG_CONFIG_PATH=[[:graph:]]+")
+                ""))
+
              ;; This file hard-codes file system layouts for specific distros
              ;; but not for ours; address that.  With this change, one can run
              ;; "perf report --symfs=$HOME/.guix-profile" (without