NixOS specific files

.envrc

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+use nix

shell.nix

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+# Use VSCode Extension: mkhl.direnv
+
+with import <nixpkgs> {};
+
+pkgs.mkShell {
+    # stdenv = pkgs.llvmPackages_16.stdenv;
+    nativeBuildInputs = with pkgs; [
+      cmake
+      conan
+      gdb
+      lldb
+      gcovr
+      mold
+      clang-tools_16 # clang-format, clang-tidy
+      gcc12
+      gcc12Stdenv
+      (doxygen.overrideAttrs (oldAttrs: rec {
+          version = "1.9.8";
+          src = fetchFromGitHub {
+            owner = "doxygen";
+            repo = "doxygen";
+            rev = "Release_${lib.replaceStrings [ "." ] [ "_" ] version}";
+            sha256 = "sha256-uQ1Fl2kmY7qmzy34NOmZCgPxVGwmqRqDvV6yEab5P4w=";
+          };
+        })
+      )
+      texlive.combined.scheme-full
+      graphviz
+      ghostscript
+      pdf2svg
+
+      ccache
+      ccacheStdenv
+      llvmPackages_16.libcxxClang # When using 'gcc' this needs to be commented out
+      gperftools
+    ];
+    buildInputs = with pkgs; [
+      xorg.libX11.dev
+      glfw
+      gl3w
+      libGLU
+      libunwind
+      gperftools
+    ];
+    LD_LIBRARY_PATH = "${pkgs.libGL}/lib:${pkgs.glfw}/lib:${pkgs.libGLU}/lib:${stdenv.cc.cc.lib}/lib:${pkgs.llvmPackages_16.libcxxabi}/lib:${pkgs.llvmPackages_16.libcxx}/lib:${pkgs.gperftools}/lib";
+}