disable JUCE web browser (not needed anyway) to avoid GTK dependency on

Linux

CMakeLists.txt

@@ -44,6 +44,10 @@ target_sources(BEAMGRID PRIVATE
 target_compile_definitions(BEAMGRID PUBLIC
     JUCE_VST3_CAN_REPLACE_VST2=0
     JUCE_USE_CAMERA_PERMISSIONS=0
+    # This plugin does not use a WebBrowserComponent. Disabling it avoids the
+    # GTK3 / WebKit2GTK development dependencies that juce_gui_extra pulls in
+    # on Linux (the <gtk/gtk.h> include fails to build otherwise).
+    JUCE_WEB_BROWSER=0
 )
 
 target_link_libraries(BEAMGRID PRIVATE

README.md

@@ -70,6 +70,25 @@ sudo pacman -S alsa-lib freetype2 libx11 libxcomposite libxcursor \
   libxext libxinerama libxrandr
 ```
 
+> **Note on `gtk/gtk.h` / `fatal error: gtk/gtk.h: No such file or directory`**
+>
+> BEAMGRID links `juce_gui_extra`, which on Linux unconditionally compiles a
+> WebKit/GTK section (see `juce_gui_extra.cpp`). Even if the GTK *runtime* is
+> installed, the build needs the **development** headers plus WebKit2GTK:
+>
+> ```sh
+> # Debian / Ubuntu
+> sudo apt-get install -y libgtk-3-dev libwebkit2gtk-4.1-dev
+> # Fedora
+> sudo dnf install -y gtk3-devel webkit2gtk3-devel
+> # Arch
+> sudo pacman -S gtk3 webkit2gtk-4.1
+> ```
+>
+> BEAMGRID does **not** use a web browser, so `JUCE_WEB_BROWSER` is disabled in
+> `CMakeLists.txt`. With that, the GTK/WebKit dev packages above are **not**
+> required to build — the error disappears even if you skip them.
+
 Build BEAMGRID:
 
 ```sh