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-rw-r--r--pkgs/applications/science/logic/satallax/default.nix5
1 files changed, 5 insertions, 0 deletions
diff --git a/pkgs/applications/science/logic/satallax/default.nix b/pkgs/applications/science/logic/satallax/default.nix
index 7249eb991d38..d3ceeadbf9a7 100644
--- a/pkgs/applications/science/logic/satallax/default.nix
+++ b/pkgs/applications/science/logic/satallax/default.nix
@@ -9,6 +9,11 @@ stdenv.mkDerivation rec {
     sha256 = "1kvxn8mc35igk4vigi5cp7w3wpxk2z3bgwllfm4n3h2jfs0vkpib";
   };
 
+  patches = [
+    # GCC9 doesn't allow default value in friend declaration.
+    ./fix-declaration-gcc9.patch
+  ];
+
   preConfigure = ''
     mkdir fake-tools
     echo "echo 'Nix-build-host.localdomain'" > fake-tools/hostname