#if !JUCE_AUDIOPROCESSOR_NO_GUI

Block out more code with

modules/juce_graphics/juce_graphics.cpp

@@ -23,6 +23,8 @@
   ==============================================================================
 */
 
+#if !JUCE_AUDIOPROCESSOR_NO_GUI
+
 #ifdef JUCE_GRAPHICS_H_INCLUDED
  /* When you add this cpp file to your project, you mustn't include it in a file where you've
     already included any other headers - just put it inside a file on its own, possibly with your config
@@ -181,3 +183,5 @@
    #include "native/freetype/FreeTypeAmalgam.c"
  }
 #endif
+
+#endif

modules/juce_gui_basics/juce_gui_basics.cpp

@@ -22,6 +22,7 @@
 
   ==============================================================================
 */
+#if !JUCE_AUDIOPROCESSOR_NO_GUI
 
 #ifdef JUCE_GUI_BASICS_H_INCLUDED
  /* When you add this cpp file to your project, you mustn't include it in a file where you've
@@ -417,3 +418,5 @@ bool juce::isWindowOnCurrentVirtualDesktop (void* x)
 #if JUCE_UNIT_TESTS
 #include "native/accessibility/juce_AccessibilityTextHelpers_test.cpp"
 #endif
+
+#endif

modules/juce_gui_extra/juce_gui_extra.cpp

@@ -22,6 +22,7 @@
 
   ==============================================================================
 */
+#if !JUCE_AUDIOPROCESSOR_NO_GUI
 
 #ifdef JUCE_GUI_EXTRA_H_INCLUDED
  /* When you add this cpp file to your project, you mustn't include it in a file where you've
@@ -196,3 +197,5 @@
                                                                                const WebView2Preferences&)
      : WebBrowserComponent (unloadWhenHidden) {}
 #endif
+
+#endif