diff --git a/devenv-module.nix b/devenv-module.nix
index 1205c97dd..4c62683b5 100644
--- a/devenv-module.nix
+++ b/devenv-module.nix
@@ -90,6 +90,7 @@ that is defined in flake-module.nix
                         hspec
                         ihp-hsx
                         ihp-postgresql-simple-extra
+                        haskell-language-server
                     ]);
 
             scripts.tests.exec = ''
@@ -111,7 +112,7 @@ that is defined in flake-module.nix
             '';
 
             languages.haskell.stack = null; # Stack is not used in IHP
-            languages.haskell.languageServer = ghcCompiler.haskell-language-server;
+            #languages.haskell.languageServer = ghcCompiler.haskell-language-server;
         };
 
         packages = {
diff --git a/flake-module.nix b/flake-module.nix
index e11b36e9d..cf767675e 100644
--- a/flake-module.nix
+++ b/flake-module.nix
@@ -52,6 +52,29 @@ ihpFlake:
                     ];
                 };
 
+                appName = lib.mkOption {
+                  description ='' 
+                  The derivation name.
+                  Can be omitted if pname and version are set, in which case it is automatically set to ''${pname}-''${version}.
+                '';
+                 type= lib.types.str;
+                 default="app";
+                };
+
+                pName = lib.mkOption {
+                  description = ''
+                      The package name.
+                  '';
+                 type= lib.types.str;
+                };
+
+                version = lib.mkOption {
+                  description = ''
+                      The package version.
+                  '';
+                 type= lib.types.str;
+                };
+
                 projectPath = lib.mkOption {
                     description = ''
                         Path to the IHP project. You likely want to set this to `./.`.