try dev shell

.gitignore

@@ -1 +1,3 @@
-vendor/*
+vendor/
+.ccls-cache/
+.ccls

ExampleApps.nix

@@ -12,13 +12,10 @@
             clang
         ];
         
-        /*buildInputs = with pkgs; [
-          ];*/
-
         buildPhase = ''
             clang++ \
             src/example_apps/MinimalApp/MinimalApp.cpp \
-            -I src -I include \
+            -I include \
             -Wall \
             -o $name 
             '';

flake.nix

@@ -264,5 +264,42 @@
             program = "${self.Archimedes.examples.MinimalApp}/bin/Archimedes";
         };
 
+        devShells.${system} = {
+            default = pkgs.mkShellNoCC {
+
+                packages = with pkgs; [
+                    clang
+
+                    glfw
+                    glew
+
+                    sdl3
+
+                    curl
+
+                    nlohmann_json
+
+                    imgui
+
+                    gamenetworkingsockets
+
+
+                ];
+
+
+                shellHook = ''
+                    cp ${(pkgs.writeText ".ccls" ''
+                        clang++
+                        -Iinputs
+                        -I.
+                        -I${gamenetworkingsockets}/include/GameNetworkingSockets
+                        -DWINDOW=1
+                        -DRENDERER=1
+                    '')} ./.ccls
+                '';
+
+            };
+        };
+
     };
 }