linking error?

flake.nix

@@ -35,8 +35,8 @@
 
                     buildPhase = ''
                         clang++ \
-                        src/example_apps/MinimalApp/*.cpp \
-                        include/utils/App/*.cpp \
+                        src/example_apps/MinimalApp/MinimalApp.cpp \
+                        include/utils/App/App.cpp \
                         -I src -I include \
                         -Wall \
                         -o $name 

include/entryPoint.h

@@ -1,9 +1,14 @@
-#ifdef APP_TYPE
+#ifdef ENTRYPOINT
+#undef ENTRYPOINT
+
+#include "utils/App/App.h"
+
+Archimedes::App* MakeApp();
 
 int main(int argc, char* argv[]) {
-    APP_TYPE app;
-    app.handleArgs(argc, argv);
-    app.run();
+    Archimedes::App* app = MakeApp();
+    app->handleArgs(argc, argv);
+    app->run();
 }
 
 #endif

src/example_apps/MinimalApp/MinimalApp.h

@@ -1,4 +1,4 @@
-#define APP_TYPE MinimalApp
+#define ENTRYPOINT
 #include "Archimedes.h"
 
 class MinimalApp : public Archimedes::App {
@@ -28,3 +28,5 @@ class MinimalApp : public Archimedes::App {
         void startModule(std::string);
 
 };
+
+Archimedes::App* MakeApp() { return new MinimalApp(); }