mono4: remove

- The minimum version of Nix required to evaluate Nixpkgs has been raised from 2.3 to 2.18.

- `mono5` has been removed. Use `mono6` or `mono` instead.

- `mono4` and `mono5` have been removed. Use `mono6` or `mono` instead.

- The `offrss` package was removed due to lack of upstream maintenance since 2012. It's recommended for users to migrate to another RSS reader

{

  callPackage,

  stdenv,

  lib,

  fetchurl,

}:

callPackage ./generic.nix rec {

  version = "4.8.1.0";

  enableParallelBuilding = false; # #32386, https://hydra.nixos.org/build/65600645

  extraPatches = lib.optionals stdenv.hostPlatform.isLinux [ ./mono4-glibc.patch ];

  env.NIX_CFLAGS_COMPILE = toString [

    "-Wno-error=implicit-function-declaration"

    "-Wno-error=implicit-int"

    "-Wno-error=incompatible-pointer-types"

    "-Wno-error=int-conversion"

    "-Wno-error=return-mismatch"

  ];

  src = fetchurl {

    url = "https://download.mono-project.com/sources/mono/mono-${version}.tar.bz2";

    sha256 = "1vyvp2g28ihcgxgxr8nhzyzdmzicsh5djzk8dk1hj5p5f2k3ijqq";

  };

}

diff --git a/mono/io-layer/processes.c b/mono/io-layer/processes.c

index 53c271a4..84bd3252 100644

--- a/mono/io-layer/processes.c

+++ b/mono/io-layer/processes.c

@@ -19,6 +19,7 @@

 #include <errno.h>

 #include <sys/types.h>

 #include <sys/stat.h>

+#include <sys/sysmacros.h>

 #include <unistd.h>

 #ifdef HAVE_SIGNAL_H

 #include <signal.h>

  mod_pkcs12 = throw "'mod_pkcs12' has been renamed to/replaced by 'apacheHttpdPackages.mod_pkcs12'"; # Converted to throw 2024-10-17

  mod_timestamp = throw "'mod_timestamp' has been renamed to/replaced by 'apacheHttpdPackages.mod_timestamp'"; # Converted to throw 2024-10-17

  mono-addins = throw "mono-addins has been removed due to its dependency on the removed mono4. Consider alternative frameworks or migrate to newer .NET technologies."; # Added 2025-08-25

  mono4 = mono6; # Added 2025-08-25

  mono5 = mono6; # Added 2025-08-25

  monero = throw "'monero' has been renamed to/replaced by 'monero-cli'"; # Converted to throw 2024-10-17

  mongodb-4_4 = throw "mongodb-4_4 has been removed, it's end of life since April 2024"; # Added 2024-04-11

  mono = mono6;

  mono4 = lowPrio (callPackage ../development/compilers/mono/4.nix { });

  mono6 = callPackage ../development/compilers/mono/6.nix { };

  mozart2 = callPackage ../development/compilers/mozart {