diff --git a/gtk/src/gtk_s9xwindow.cpp b/gtk/src/gtk_s9xwindow.cpp
index 4cc4c129..6ff764d7 100644
--- a/gtk/src/gtk_s9xwindow.cpp
+++ b/gtk/src/gtk_s9xwindow.cpp
@@ -1534,8 +1534,9 @@ double
 Snes9xWindow::get_refresh_rate ()
 {
     double refresh_rate = 0.0;
+#if defined GDK_WINDOWING_X11 || defined GDK_WINDOWING_WAYLAND
     GdkDisplay *display = gtk_widget_get_display (window);
-    GdkWindow *gdk_window =  gtk_widget_get_window (window);
+#endif
 
 #ifdef GDK_WINDOWING_X11
     if (GDK_IS_X11_DISPLAY (display))
@@ -1549,6 +1550,7 @@ Snes9xWindow::get_refresh_rate ()
 #ifdef GDK_WINDOWING_WAYLAND
     if (GDK_IS_WAYLAND_DISPLAY (display))
     {
+        GdkWindow *gdk_window =  gtk_widget_get_window (window);
         GdkMonitor *monitor = gdk_display_get_monitor_at_window(display, gdk_window);
         refresh_rate = (double) gdk_monitor_get_refresh_rate(monitor) / 1000.0;
     }
diff --git a/shaders/glsl.cpp b/shaders/glsl.cpp
index 022b10b1..47bb74bc 100644
--- a/shaders/glsl.cpp
+++ b/shaders/glsl.cpp
@@ -268,6 +268,7 @@ static std::string canonicalize(const std::string &noncanonical)
     return filename_string;
 }
 
+#ifdef USE_SLANG
 static GLuint string_to_format(char *format)
 {
 #define MATCH(s, f)                                                            \
@@ -306,6 +307,7 @@ static GLuint string_to_format(char *format)
 
     return GL_RGBA;
 }
+#endif
 
 // filename must be canonical
 void GLSLShader::read_shader_file_with_includes(std::string filename,