diff --git a/maintainers/maintainer-list.nix b/maintainers/maintainer-list.nix
index 90d5bc9c18e5..2ce0ea992d7c 100644
--- a/maintainers/maintainer-list.nix
+++ b/maintainers/maintainer-list.nix
@@ -23687,6 +23687,12 @@
     githubId = 158321;
     name = "Stewart Mackenzie";
   };
+  skaphi = {
+    name = "Oskar Philipsson";
+    email = "oskar.philipsson@gmail.com";
+    github = "skaphi";
+    githubId = 41991455;
+  };
   skeuchel = {
     name = "Steven Keuchel";
     email = "steven.keuchel@gmail.com";
diff --git a/pkgs/by-name/rt/rtklib-ex/package.nix b/pkgs/by-name/rt/rtklib-ex/package.nix
new file mode 100644
index 000000000000..f996f266b3ea
--- /dev/null
+++ b/pkgs/by-name/rt/rtklib-ex/package.nix
@@ -0,0 +1,54 @@
+{
+  stdenv,
+  cmake,
+  nix-update-script,
+  blas,
+  lapack,
+  lib,
+  fetchFromGitHub,
+  qt6,
+}:
+
+stdenv.mkDerivation rec {
+  pname = "rtklib-ex";
+  version = "2.5.0";
+
+  src = fetchFromGitHub {
+    owner = "rtklibexplorer";
+    repo = "RTKLIB";
+    tag = "v${version}";
+    hash = "sha256-j00VEQvxOiAc3EQX3x2b3RxYkbtvCZ17ugnW6b6ChWU=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    blas
+    lapack
+    qt6.wrapQtAppsHook
+    qt6.qttools
+  ];
+
+  buildInputs = [
+    qt6.qtbase
+    qt6.qtserialport
+  ];
+
+  doCheck = true;
+
+  cmakeFlags = [
+    (lib.cmakeFeature "CMAKE_INSTALL_DATAROOTDIR" "${placeholder "out"}/share")
+  ];
+
+  passthru = {
+    updateScript = nix-update-script { };
+  };
+
+  meta = {
+    description = "Open Source Program Package for GNSS Positioning";
+    homepage = "https://rtkexplorer.com";
+    changelog = "https://github.com/rtklibexplorer/RTKLIB/releases/tag/${src.tag}";
+    license = lib.licenses.bsd2;
+    maintainers = [ lib.maintainers.skaphi ];
+    platforms = lib.platforms.linux;
+  };
+}