From e4f04c32f5877ecf5423b20a1700c63b63ea02c9 Mon Sep 17 00:00:00 2001
From: Grimmauld <Grimmauld@grimmauld.de>
Date: Sun, 6 Apr 2025 13:24:02 +0200
Subject: [PATCH] boost: drop unused expat dependency

The `expat` was removed upstream in 10135eeab5f7cd28e43f00699dea724231cd7556 [1].
Boost used SVN at the time making precise timeline checks bothersome,
but it seems the first release including this drop was in late 2010.

Nixpkgs had the expat include logic in 00b296762a808243b4868a1c74aceb87a5ec8e90 for version 1.43.
We no longer maintain such ancient versions of boost, yet the logic was still there.

[1] https://github.com/boostorg/graph/commit/10135eeab5f7cd28e43f00699dea724231cd7556
---
 pkgs/development/libraries/boost/generic.nix | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index f5530b1545d6..90d651b81a3d 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -2,7 +2,6 @@
   lib,
   stdenv,
   icu,
-  expat,
   zlib,
   bzip2,
   zstd,
@@ -87,8 +86,6 @@ let
       "variant=${variant}"
       "threading=${threading}"
       "link=${link}"
-      "-sEXPAT_INCLUDE=${expat.dev}/include"
-      "-sEXPAT_LIBPATH=${expat.out}/lib"
     ]
     ++ lib.optionals (lib.versionAtLeast version "1.85") [
       (
@@ -340,7 +337,6 @@ stdenv.mkDerivation {
   ] ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
   buildInputs =
     [
-      expat
       zlib
       bzip2
       libiconv