From 48728f5ca4b90407bc83fd02ab5ca7f6ed9d9d93 Mon Sep 17 00:00:00 2001
From: Yves Fischer <yvesf+git@xapek.org>
Date: Tue, 6 Sep 2022 21:44:39 +0200
Subject: [PATCH] mupdf: fix finding pkg-config under cross-compilation

---
 pkgs/applications/misc/mupdf/default.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/applications/misc/mupdf/default.nix b/pkgs/applications/misc/mupdf/default.nix
index 88f804ccf81f..2010268eade1 100644
--- a/pkgs/applications/misc/mupdf/default.nix
+++ b/pkgs/applications/misc/mupdf/default.nix
@@ -5,6 +5,7 @@
 , copyDesktopItems
 , makeDesktopItem
 , desktopToDarwinBundle
+, buildPackages
 , pkg-config
 , freetype
 , harfbuzz
@@ -49,13 +50,17 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     sed -i "s/__OPENJPEG__VERSION__/${openJpegVersion}/" source/fitz/load-jpx.c
+    substituteInPlace Makerules --replace "(shell pkg-config" "(shell $PKG_CONFIG"
   '';
 
   # Use shared libraries to decrease size
   buildFlags = [ "shared" ];
 
-  makeFlags = [ "prefix=$(out)" "USE_SYSTEM_LIBS=yes" ]
-    ++ lib.optionals (!enableX11) [ "HAVE_X11=no" ]
+  makeFlags = [
+    "prefix=$(out)"
+    "USE_SYSTEM_LIBS=yes"
+    "PKG_CONFIG=${buildPackages.pkg-config}/bin/${buildPackages.pkg-config.targetPrefix}pkg-config"
+  ] ++ lib.optionals (!enableX11) [ "HAVE_X11=no" ]
     ++ lib.optionals (!enableGL) [ "HAVE_GLUT=no" ];
 
   nativeBuildInputs = [ pkg-config ]