diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3e26ef7
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+export BIBINPUTS="$PWD:$BIBINPUTS"
diff --git a/flake.nix b/flake.nix
deleted file mode 100644
index 3872b41..0000000
--- a/flake.nix
+++ /dev/null
@@ -1,114 +0,0 @@
-rec {
-  description = "";
-
-  inputs = {
-    nixpkgs.url = "nixpkgs"; # Use nixpkgs from system registry
-    flake-utils.url = "github:numtide/flake-utils";
-  };
-
-  outputs = {
-    self,
-    nixpkgs,
-    flake-utils,
-  }:
-  # Create a shell (and possibly package) for each possible system, not only x86_64-linux
-    flake-utils.lib.eachDefaultSystem (system: let
-      # =========================================================================================
-      # Define pkgs/stdenvs
-      # =========================================================================================
-      pkgs = import nixpkgs {
-        inherit system;
-        config.allowUnfree = true;
-        overlays = [];
-      };
-
-      inherit (pkgs) lib stdenv;
-
-      # =========================================================================================
-      # Define shell environment
-      # =========================================================================================
-
-      # Setup the shell when entering the "nix develop" environment (bash script).
-      shellHook = let
-        # Add project-local fish abbrs here
-        abbrs = {};
-
-        eraseAbbr = name: value: ''abbr --erase ${name} 2>/dev/null'';
-        createAbbr = name: value: ''abbr -a ${name} "${value}"'';
-
-        # This will be sourced by the global fish config if INIT_PROJECT_SHELL gets unset
-        unloadProjectShell = pkgs.writers.writeFish "unload-shell.fish" ''
-          echo "Unloading \"${description}\" environment..."
-
-          ${builtins.concatStringsSep "\n" (lib.mapAttrsToList eraseAbbr abbrs)}
-        '';
-
-        # This will be sourced by the global fish config if INIT_PROJECT_SHELL gets set
-        initProjectShell = pkgs.writers.writeFish "init-shell.fish" ''
-          # Unload just in case, to not have redefinition errors
-          source ${unloadProjectShell}
-
-          echo "Sourcing \"${description}\" environment..."
-
-          ${builtins.concatStringsSep "\n" (lib.mapAttrsToList createAbbr abbrs)}
-        '';
-      in
-        builtins.concatStringsSep "\n" [
-          # Launch into pure fish shell
-          ''
-            # Determine the project root, used e.g. in cmake scripts
-            export FLAKE_PROJECT_ROOT="$(git rev-parse --show-toplevel)"
-
-            # Can't do the "exec" with nix-direnv
-            # - The "exec fish" would call direnv again => Infinite loop
-            # - The shellHook is Bash/POSIX, so fish syntax doesn't work
-
-            # Use this for "nix develop" without direnv
-            # exec "$(type -p fish)" -C "source ${initProjectShell} && abbr -a menu '${pkgs.bat}/bin/bat "${initProjectShell}"'"
-
-            # Use this for direnv without "nix develop"
-            export INIT_PROJECT_SHELL="${initProjectShell}"
-            export UNLOAD_PROJECT_SHELL="${unloadProjectShell}"
-          ''
-        ];
-
-      # ===========================================================================================
-      # Define custom dependencies
-      # ===========================================================================================
-
-      # ===========================================================================================
-      # Specify dependencies
-      # https://nixos.org/manual/nixpkgs/stable/#ssec-stdenv-dependencies-overview
-      # Just for a "nix develop" shell, buildInputs can be used for everything.
-      # ===========================================================================================
-
-      # Add dependencies to nativeBuildInputs if they are executed during the build:
-      # - Those which are needed on $PATH during the build, for example cmake and pkg-config
-      # - Setup hooks, for example makeWrapper
-      # - Interpreters needed by patchShebangs for build scripts (with the --build flag), which can be the case for e.g. perl
-      nativeBuildInputs = with pkgs; [];
-
-      # Add dependencies to buildInputs if they will end up copied or linked into the final output or otherwise used at runtime:
-      # - Libraries used by compilers, for example zlib
-      # - Interpreters needed by patchShebangs for scripts which are installed, which can be the case for e.g. perl
-      buildInputs = with pkgs; [];
-      # ===========================================================================================
-      # Define buildable + installable packages
-      # ===========================================================================================
-    in rec {
-      devShells = {
-        # Provide default environment for "nix develop".
-        # Other environments can be added below.
-        default = pkgs.mkShell {
-          inherit nativeBuildInputs buildInputs shellHook;
-          name = description;
-
-          # =========================================================================================
-          # Define environment variables
-          # =========================================================================================
-
-          BIBINPUTS = "$PWD:$BIBINPUTS";
-        };
-      };
-    });
-}