From 3c083ef2ee3ceb78bb38daebb17d87419710a365 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Tue, 15 Oct 2024 21:50:53 +0100
Subject: [PATCH] dmenu: fix build on `staging-next`

Without the change `dmenu` fails to build on `staging-next` as:

    $ nix build --no-link -f. dmenu -L
    ...
    dmenu> build flags: SHELL=/nix/store/mm0pa3z7kk6jh1i9rkxqxjqmd8h1qpxf-bash-5.2p37/bin/bash CC:=\$\(CC\)
    dmenu> cp config.def.h config.h
    dmenu> gcc -c -std=c99 -pedantic -Wall -Os -I/usr/X11R6/include -I/usr/include/freetype2 -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"5.3\" -DXINERAMA dmenu.c
    dmenu> In file included from dmenu.c:17:
    dmenu> /nix/store/2rxphcg0qabc3a8c4lvy610sm03bh72y-libXft-2.3.8-dev/include/X11/Xft/Xft.h:40:10: fatal error: ft2build.h: No such file or directory
    dmenu>    40 | #include <ft2build.h>
    dmenu>       |          ^~~~~~~~~~~~
    dmenu> compilation terminated.
    dmenu> make: *** [Makefile:12: dmenu.o] Error 1

The change uses `pkg-config` to discover library dependencies and lib paths.
---
 pkgs/applications/misc/dmenu/default.nix | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/pkgs/applications/misc/dmenu/default.nix b/pkgs/applications/misc/dmenu/default.nix
index 089a421ccc15..75ae73179cf3 100644
--- a/pkgs/applications/misc/dmenu/default.nix
+++ b/pkgs/applications/misc/dmenu/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, libX11, libXinerama, libXft, zlib, writeText
+{ lib, stdenv, fetchurl, fontconfig, libX11, libXinerama, libXft, pkg-config, zlib, writeText
 , conf ? null, patches ? null
   # update script dependencies
 , gitUpdater }:
@@ -12,7 +12,8 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-Go9T5v0tdJg57IcMXiez4U2lw+6sv8uUXRWeHVQzeV8=";
   };
 
-  buildInputs = [ libX11 libXinerama zlib libXft ];
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ fontconfig libX11 libXinerama zlib libXft ];
 
   inherit patches;
 
@@ -28,11 +29,15 @@ stdenv.mkDerivation rec {
   '';
 
   preConfigure = ''
-    sed -i "s@PREFIX = /usr/local@PREFIX = $out@g" config.mk
+    makeFlagsArray+=(
+      PREFIX="$out"
+      CC="$CC"
+      # default config.mk hardcodes dependent libraries and include paths
+      INCS="`$PKG_CONFIG --cflags fontconfig x11 xft xinerama`"
+      LIBS="`$PKG_CONFIG --libs   fontconfig x11 xft xinerama`"
+    )
   '';
 
-  makeFlags = [ "CC:=$(CC)" ];
-
   passthru.updateScript = gitUpdater { url = "git://git.suckless.org/dmenu"; };
 
   meta = with lib; {