From cd9f96a6adbe43a9ccdfc8c22cf22fc0d6fb0960 Mon Sep 17 00:00:00 2001
From: sternenseemann <sternenseemann@systemli.org>
Date: Sun, 14 Sep 2025 00:46:06 +0200
Subject: [PATCH] diagrams-builder: disable cairo backend (incompatible with
 Stackage LTS)

---
 .../haskell-modules/configuration-common.nix          | 11 +++++++++++
 pkgs/tools/graphics/diagrams-builder/default.nix      |  3 ++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 7d9445381471..3ec55b5c2df3 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -3289,6 +3289,17 @@ with haskellLib;
   # 2025-04-23: missing test data
   llvm-pretty-bc-parser = dontCheck super.llvm-pretty-bc-parser;
 
+  # diagrams-builder wants diagrams-cairo < 1.5 for its cairo executable,
+  # but Stackage LTS 24 contains diagrams-cairo >= 1.5.
+  # As such it is difficult to provide (2025-09-13)
+  # ATTN: This needs to match ../../tools/graphics/diagrams-builder/default.nix:/backends
+  # TODO: can we reinstate this by manually passing an older version?
+  diagrams-builder = disableCabalFlag "cairo" (
+    super.diagrams-builder.override {
+      diagrams-cairo = null;
+    }
+  );
+
   # 2025-04-23: Allow bytestring >= 0.12
   # https://github.com/mrkkrp/wave/issues/48
   wave = doJailbreak super.wave;
diff --git a/pkgs/tools/graphics/diagrams-builder/default.nix b/pkgs/tools/graphics/diagrams-builder/default.nix
index 89d8bfbfde45..e7435f5ebd36 100644
--- a/pkgs/tools/graphics/diagrams-builder/default.nix
+++ b/pkgs/tools/graphics/diagrams-builder/default.nix
@@ -34,8 +34,9 @@ let
 
   backends = [
     "svg"
-    "cairo"
     "ps"
+    # See ../../../development/haskell-modules/configuration-common.nix:/diagrams-builder.=
+    # "cairo"
   ];
 
 in