pangolin: drop

The latest ffmpeg updates broke the `pangolin` build, and although
updating it to the latest version fixes the build again, @infinisil and I
also weren't able to figure out where exactly this is still actively being
used.

The library shares its name with a reverse proxy, and all references a
quick ripgrep for `pangolin` returns are either the NixOS module or the
tests for said reverse proxy.

@expipiplus1 also stopped maintaining the package as of
e134422465 (still before the 2024.11
release), qualifying this package for removal as per RFC 0180 [^1].

[^1]: https://github.com/NixOS/rfcs/blob/master/rfcs/0180-broken-package-removal.md

pkgs/by-name/pa/pangolin/package.nix

@@ -1,68 +0,0 @@
-{
-  stdenv,
-  lib,
-  fetchFromGitHub,
-  cmake,
-  pkg-config,
-  doxygen,
-  libGL,
-  glew,
-  xorg,
-  ffmpeg,
-  libjpeg,
-  libpng,
-  libtiff,
-  eigen,
-}:
-
-stdenv.mkDerivation (finalAttrs: {
-  pname = "pangolin";
-  version = "0.9.1";
-
-  src = fetchFromGitHub {
-    owner = "stevenlovegrove";
-    repo = "Pangolin";
-    rev = "v${finalAttrs.version}";
-    sha256 = "sha256-B5YuNcJZHjR3dlVs66rySi68j29O3iMtlQvCjTUZBeY=";
-  };
-
-  nativeBuildInputs = [
-    cmake
-    pkg-config
-    doxygen
-  ];
-
-  buildInputs = [
-    libGL
-    glew
-    xorg.libX11
-    ffmpeg
-    libjpeg
-    libpng
-    libtiff.out
-    eigen
-  ];
-
-  # The tests use cmake's findPackage to find the installed version of
-  # pangolin, which isn't what we want (or available).
-  doCheck = false;
-  cmakeFlags = [ (lib.cmakeBool "BUILD_TESTS" false) ];
-
-  meta = {
-    description = "Lightweight portable rapid development library for managing OpenGL display / interaction and abstracting video input";
-    longDescription = ''
-      Pangolin is a lightweight portable rapid development library for managing
-      OpenGL display / interaction and abstracting video input. At its heart is
-      a simple OpenGl viewport manager which can help to modularise 3D
-      visualisation without adding to its complexity, and offers an advanced
-      but intuitive 3D navigation handler. Pangolin also provides a mechanism
-      for manipulating program variables through config files and ui
-      integration, and has a flexible real-time plotter for visualising
-      graphical data.
-    '';
-    homepage = "https://github.com/stevenlovegrove/Pangolin";
-    license = lib.licenses.mit;
-    maintainers = [ ];
-    platforms = lib.platforms.all;
-  };
-})

pkgs/top-level/aliases.nix

@@ -1209,6 +1209,7 @@ mapAliases {
   pacup = throw "'pacup' has been renamed to/replaced by 'perlPackages.pacup'"; # Converted to throw 2025-10-27
   PageEdit = throw "'PageEdit' has been renamed to/replaced by 'pageedit'"; # Converted to throw 2025-10-27
   pal = throw "pal has been removed, as it was broken"; # Added 2025-08-25
+  pangolin = throw "pangolin has been removed due to lack of maintenance"; # Added 2025-11-17
   paperless-ng = throw "'paperless-ng' has been renamed to/replaced by 'paperless-ngx'"; # Converted to throw 2025-10-27
   parcellite = throw "'parcellite' was remove due to lack of maintenance and relying on gtk2"; # Added 2025-10-03
   patchelfStable = throw "'patchelfStable' has been renamed to/replaced by 'patchelf'"; # Converted to throw 2025-10-27