From b1814ba4b19b2c12ca603647d80033b59bc26b67 Mon Sep 17 00:00:00 2001
From: Divam <dfordivam@gmail.com>
Date: Wed, 25 Aug 2021 19:54:49 +0900
Subject: [PATCH] ghc: add the Cabal ghcjs support patch

(cherry picked from commit feac31b1f05bf8be4681b461987f26a37a47c60f)
---
 pkgs/development/compilers/ghc/8.10.7.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/development/compilers/ghc/8.10.7.nix b/pkgs/development/compilers/ghc/8.10.7.nix
index e3b09ecf155..5badd8ca7e5 100644
--- a/pkgs/development/compilers/ghc/8.10.7.nix
+++ b/pkgs/development/compilers/ghc/8.10.7.nix
@@ -137,6 +137,15 @@ stdenv.mkDerivation (rec {
             url = "https://raw.githubusercontent.com/input-output-hk/haskell.nix/122bd81150386867da07fdc9ad5096db6719545a/overlays/patches/ghc/cabal-host.patch";
       sha256 = "sha256:0yd0sajgi24sc1w5m55lkg2lp6kfkgpp3lgija2c8y3cmkwfpdc1";
     })
+
+    # In order to build ghcjs packages, the Cabal of the ghc used for the ghcjs
+    # needs to be patched. Ref https://github.com/haskell/cabal/pull/7575
+    (fetchpatch {
+      url = "https://github.com/haskell/cabal/commit/369c4a0a54ad08a9e6b0d3bd303fedd7b5e5a336.patch";
+      sha256 = "120f11hwyaqa0pq9g5l1300crqij49jg0rh83hnp9sa49zfdwx1n";
+      stripLen = 3;
+      extraPrefix = "libraries/Cabal/Cabal/";
+    })
   ] ++ lib.optionals stdenv.isDarwin [
     # Make Block.h compile with c++ compilers. Remove with the next release
     (fetchpatch {