diff --git a/include/backend/x11.h b/include/backend/x11.h
index 9c0c1a4d1..704d48f14 100644
--- a/include/backend/x11.h
+++ b/include/backend/x11.h
@@ -9,10 +9,6 @@
 #include <xcb/xcb.h>
 #include <xcb/present.h>
 
-#if HAS_XCB_ERRORS
-#include <xcb/xcb_errors.h>
-#endif
-
 #include <pixman.h>
 #include <wlr/backend/x11.h>
 #include <wlr/interfaces/wlr_keyboard.h>
@@ -21,6 +17,12 @@
 #include <wlr/types/wlr_pointer.h>
 #include <wlr/render/drm_format_set.h>
 
+#include "config.h"
+
+#if HAS_XCB_ERRORS
+#include <xcb/xcb_errors.h>
+#endif
+
 #define XCB_EVENT_RESPONSE_TYPE_MASK 0x7f
 
 struct wlr_x11_backend;
diff --git a/include/meson.build b/include/meson.build
index 358aada88..bc91a7660 100644
--- a/include/meson.build
+++ b/include/meson.build
@@ -30,3 +30,11 @@ install_subdir('wlr',
 	install_dir: get_option('includedir'),
 	exclude_files: exclude_files,
 )
+
+foreach name, have : internal_features
+	internal_config.set10('HAS_' + name.underscorify().to_upper(), have)
+endforeach
+wlr_files += configure_file(
+	output: 'config.h',
+	configuration: internal_config,
+)
diff --git a/include/xwayland/xwm.h b/include/xwayland/xwm.h
index 391e09ab1..7ed97b157 100644
--- a/include/xwayland/xwm.h
+++ b/include/xwayland/xwm.h
@@ -5,10 +5,12 @@
 #include <wlr/config.h>
 #include <wlr/xwayland.h>
 #include <xcb/render.h>
+#include "config.h"
+#include "xwayland/selection.h"
+
 #if HAS_XCB_ERRORS
 #include <xcb/xcb_errors.h>
 #endif
-#include "xwayland/selection.h"
 
 /* This is in xcb/xcb_event.h, but pulling xcb-util just for a constant
  * others redefine anyway is meh
diff --git a/meson.build b/meson.build
index fc3f88afd..0a584621e 100644
--- a/meson.build
+++ b/meson.build
@@ -99,6 +99,7 @@ internal_features = {
 	'xcb-errors': false,
 	'egl': false,
 }
+internal_config = configuration_data()
 
 wayland_project_options = ['tests=false', 'documentation=false']
 wayland_server = dependency('wayland-server',
@@ -158,13 +159,6 @@ subdir('xwayland')
 
 subdir('include')
 
-foreach name, have : internal_features
-	add_project_arguments(
-		'-DHAS_@0@=@1@'.format(name.underscorify().to_upper(), have.to_int()),
-		language: 'c',
-	)
-endforeach
-
 wlr_inc = include_directories('include')
 proto_inc = include_directories('protocol')