From 7b203a8cdf9d12ac2ef116f27c5454fb53e8e7fd Mon Sep 17 00:00:00 2001
From: sterni <sternenseemann@systemli.org>
Date: Fri, 29 May 2026 11:45:29 +0200
Subject: [PATCH] haskell.packages.ghc9{0,4,6}.semaphore-compat: keep using
 1.0.0

semaphore-compat 2.0.0 has just been released, but no GHC ships it as
a core package yet, so using 1.0.0 for GHC <9.8 makes more sense as it
matches Stackage Nightly.
---
 .../configuration-ghc-9.0.x.nix               |  2 +-
 .../configuration-hackage2nix/main.yaml       |  1 +
 .../haskell-modules/hackage-packages.nix      | 24 +++++++++++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix b/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
index 1fffe94c2a2c..45996a0a113a 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-9.0.x.nix
@@ -41,7 +41,7 @@ self: super: {
   # core pkgs on later GHCs that we can reasonably provide a stub
   # or Hackage released version for (though they may not build).
   Cabal-syntax = self.Cabal-syntax_3_6_0_0;
-  semaphore-compat = self.semaphore-compat_2_0_0;
+  semaphore-compat = self.semaphore-compat_1_0_0;
   os-string = self.os-string_2_0_10;
   file-io = self.file-io_0_2_0;
   # Would need 2.25.*, but let's not bother
diff --git a/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml b/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
index 4fc015f6b294..38ff50a1186f 100644
--- a/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
+++ b/pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml
@@ -119,6 +119,7 @@ extra-packages:
   - ormolu == 0.7.4.0                   # 2023-09-21: for ghc-lib-parser 9.8 compat
   - path == 0.9.5                       # 2025-09-21: Pin for hls on ghc 9.4
   - postgresql-binary < 0.14            # 2025-01-19: Needed for building postgrest
+  - semaphore-compat == 1.0.*           # 2026-05-27: Match GHC 9.2 / Stackage Nightly
   - shake-cabal < 0.2.2.3               # 2023-07-01: last version to support Cabal 3.6.*
   - ShellCheck == 0.9.0                 # 2024-03-21: pinned by haskell-ci
   - simple-get-opt < 0.5                # 2025-05-01: for crux-0.7.2
diff --git a/pkgs/development/haskell-modules/hackage-packages.nix b/pkgs/development/haskell-modules/hackage-packages.nix
index d3be4304a3da..09eb41819830 100644
--- a/pkgs/development/haskell-modules/hackage-packages.nix
+++ b/pkgs/development/haskell-modules/hackage-packages.nix
@@ -609510,6 +609510,30 @@ self: {
     }
   ) { };
 
+  semaphore-compat_1_0_0 = callPackage (
+    {
+      mkDerivation,
+      base,
+      exceptions,
+      unix,
+    }:
+    mkDerivation {
+      pname = "semaphore-compat";
+      version = "1.0.0";
+      sha256 = "1qnrdqayrdazmsflh37p1igd25nh1cfgn4k1v3jwwb0w0amnyvhw";
+      revision = "4";
+      editedCabalFile = "1sgk940k24ig1r50ycz4w79591hqjys4sdmfifgsr6zcq3183zrd";
+      libraryHaskellDepends = [
+        base
+        exceptions
+        unix
+      ];
+      description = "Cross-platform abstraction for system semaphores";
+      license = lib.meta.getLicenseFromSpdxId "BSD-3-Clause";
+      hydraPlatforms = lib.platforms.none;
+    }
+  ) { };
+
   semaphore-compat_2_0_0 = callPackage (
     {
       mkDerivation,