From 01e4dac6b3c1ca14ebebe2b59b06f48c692a9be6 Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Wed, 13 May 2026 14:48:35 +0200
Subject: [PATCH 1/3] boost: strictDeps

---
 pkgs/development/libraries/boost/generic.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index 09e6aa28c567..5f219a93418a 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -423,5 +423,7 @@ stdenv.mkDerivation {
   ];
   setOutputFlags = false;
 
+  strictDeps = true;
+
   __structuredAttrs = true;
 }

From 097b8a0ef0503be85b9845d483a5445b567e4160 Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Sat, 16 May 2026 23:49:04 +0200
Subject: [PATCH 2/3] python3Packages.boost: fix use of user-config.jam

---
 pkgs/development/libraries/boost/generic.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index 5f219a93418a..2c5bcf0c7c0e 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -74,6 +74,7 @@ let
 
   needUserConfig =
     stdenv.hostPlatform != stdenv.buildPlatform
+    || enablePython
     || useMpi
     || (stdenv.hostPlatform.isDarwin && enableShared);
 

From 52a17d79945fd79d6ef161d708b3a277336a9b7a Mon Sep 17 00:00:00 2001
From: Guilhem Saurel <guilhem.saurel@laas.fr>
Date: Tue, 5 May 2026 11:25:50 +0200
Subject: [PATCH 3/3] boost191: init at 1.91.0

---
 pkgs/by-name/bo/boost-build/package.nix      |  4 ++-
 pkgs/development/libraries/boost/1.91.nix    | 26 ++++++++++++++++++++
 pkgs/development/libraries/boost/default.nix |  1 +
 pkgs/top-level/all-packages.nix              |  1 +
 4 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/development/libraries/boost/1.91.nix

diff --git a/pkgs/by-name/bo/boost-build/package.nix b/pkgs/by-name/bo/boost-build/package.nix
index f789f8c0cb82..b3f17995518a 100644
--- a/pkgs/by-name/bo/boost-build/package.nix
+++ b/pkgs/by-name/bo/boost-build/package.nix
@@ -35,7 +35,9 @@ stdenv.mkDerivation {
   patches =
     useBoost.boostBuildPatches or [ ]
     ++ lib.optional (
-      useBoost ? version && lib.versionAtLeast useBoost.version "1.81"
+      useBoost ? version
+      && lib.versionAtLeast useBoost.version "1.81"
+      && lib.versionOlder useBoost.version "1.88"
     ) ./fix-clang-target.patch;
 
   postPatch =
diff --git a/pkgs/development/libraries/boost/1.91.nix b/pkgs/development/libraries/boost/1.91.nix
new file mode 100644
index 000000000000..6a0587e5cc38
--- /dev/null
+++ b/pkgs/development/libraries/boost/1.91.nix
@@ -0,0 +1,26 @@
+{
+  lib,
+  callPackage,
+  fetchurl,
+  ...
+}@args:
+
+callPackage ./generic.nix (
+  args
+  // rec {
+    version = "1.91.0";
+
+    src =
+      let
+        underVersion = lib.replaceString "." "_" version;
+      in
+      fetchurl {
+        urls = [
+          "https://archives.boost.io/release/${version}/source/boost_${underVersion}.tar.bz2"
+          # "mirror://sourceforge/boost/boost_${underVersion}.tar.bz2" 1.91.0.beta1 is available, but not 1.91.0
+        ];
+        # SHA256 from https://www.boost.org/releases/1.91.0/
+        sha256 = "de5e6b0e4913395c6bdfa90537febd9028ea4c0735d2cdb0cd9b45d5f51264f5";
+      };
+  }
+)
diff --git a/pkgs/development/libraries/boost/default.nix b/pkgs/development/libraries/boost/default.nix
index 930cfab4e8bf..c9eb8ec98b63 100644
--- a/pkgs/development/libraries/boost/default.nix
+++ b/pkgs/development/libraries/boost/default.nix
@@ -31,4 +31,5 @@ in
   boost188 = makeBoost ./1.88.nix;
   boost189 = makeBoost ./1.89.nix;
   boost190 = makeBoost ./1.90.nix;
+  boost191 = makeBoost ./1.91.nix;
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index dad4830b1531..5f2e711b1dca 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6023,6 +6023,7 @@ with pkgs;
     boost188
     boost189
     boost190
+    boost191
     ;
 
   boost = boost189;