diff --git a/.build.yml b/.build.yml
index 8b2f9c1f..4b3e197d 100644
--- a/.build.yml
+++ b/.build.yml
@@ -25,4 +25,4 @@ tasks:
       ninja
   - clang: |
       cd wlroots/build-clang
-      ninja
+      ninja scan-build
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index a666ce71..5396dcd4 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -344,7 +344,8 @@ static void drm_connector_start_renderer(struct wlr_drm_connector *conn) {
 
 void enable_drm_connector(struct wlr_output *output, bool enable) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
-	if (conn->state != WLR_DRM_CONN_CONNECTED) {
+	if (conn->state != WLR_DRM_CONN_CONNECTED
+			&& conn->state != WLR_DRM_CONN_NEEDS_MODESET) {
 		return;
 	}
 
@@ -563,7 +564,7 @@ static bool drm_connector_set_mode(struct wlr_output *output,
 	struct wlr_drm_crtc *crtc = conn->crtc;
 	if (!crtc) {
 		wlr_log(WLR_ERROR, "Unable to match %s with a CRTC", conn->output.name);
-		goto error_conn;
+		return false;
 	}
 	wlr_log(WLR_DEBUG, "%s: crtc=%td ovr=%td pri=%td cur=%td", conn->output.name,
 		crtc - drm->crtcs,
@@ -867,7 +868,9 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
 	// +1 so length can never be 0, which is undefined behaviour.
 	// Last element isn't used.
 	bool seen[seen_len + 1];
-	memset(seen, 0, sizeof(seen));
+	memset(seen, false, sizeof(seen));
+	size_t new_outputs_len = 0;
+	struct wlr_drm_connector *new_outputs[res->count_connectors + 1];
 
 	for (int i = 0; i < res->count_connectors; ++i) {
 		drmModeConnector *drm_conn = drmModeGetConnector(drm->fd,
@@ -973,13 +976,10 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
 				wl_list_insert(&wlr_conn->output.modes, &mode->wlr_mode.link);
 			}
 
-			wlr_output_update_enabled(&wlr_conn->output, true);
+			wlr_output_update_enabled(&wlr_conn->output, wlr_conn->crtc != NULL);
 
 			wlr_conn->state = WLR_DRM_CONN_NEEDS_MODESET;
-			wlr_log(WLR_INFO, "Sending modesetting signal for '%s'",
-				wlr_conn->output.name);
-			wlr_signal_emit_safe(&drm->backend.events.new_output,
-				&wlr_conn->output);
+			new_outputs[new_outputs_len++] = wlr_conn;
 		} else if (wlr_conn->state == WLR_DRM_CONN_CONNECTED &&
 				drm_conn->connection != DRM_MODE_CONNECTED) {
 			wlr_log(WLR_INFO, "'%s' disconnected", wlr_conn->output.name);
@@ -1010,6 +1010,15 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
 		wl_list_remove(&conn->link);
 		free(conn);
 	}
+
+	for (size_t i = 0; i < new_outputs_len; ++i) {
+		struct wlr_drm_connector *conn = new_outputs[i];
+
+		wlr_log(WLR_INFO, "Requesting modeset for '%s'",
+			conn->output.name);
+		wlr_signal_emit_safe(&drm->backend.events.new_output,
+			&conn->output);
+	}
 }
 
 static void page_flip_handler(int fd, unsigned seq,
diff --git a/backend/libinput/tablet_pad.c b/backend/libinput/tablet_pad.c
index 579a11cf..0642f925 100644
--- a/backend/libinput/tablet_pad.c
+++ b/backend/libinput/tablet_pad.c
@@ -28,7 +28,7 @@ static void add_pad_group_from_libinput(struct wlr_tablet_pad *pad,
 			++group->ring_count;
 		}
 	}
-	group->rings = calloc(sizeof(int), group->ring_count);
+	group->rings = calloc(sizeof(unsigned int), group->ring_count);
 	size_t ring = 0;
 	for (size_t i = 0; i < pad->ring_count; ++i) {
 		if (libinput_tablet_pad_mode_group_has_ring(li_group, i)) {
@@ -41,7 +41,7 @@ static void add_pad_group_from_libinput(struct wlr_tablet_pad *pad,
 			++group->strip_count;
 		}
 	}
-	group->strips = calloc(sizeof(int), group->strip_count);
+	group->strips = calloc(sizeof(unsigned int), group->strip_count);
 	size_t strip = 0;
 	for (size_t i = 0; i < pad->strip_count; ++i) {
 		if (libinput_tablet_pad_mode_group_has_strip(li_group, i)) {
@@ -54,7 +54,7 @@ static void add_pad_group_from_libinput(struct wlr_tablet_pad *pad,
 			++group->button_count;
 		}
 	}
-	group->buttons = calloc(sizeof(int), group->button_count);
+	group->buttons = calloc(sizeof(unsigned int), group->button_count);
 	size_t button = 0;
 	for (size_t i = 0; i < pad->button_count; ++i) {
 		if (libinput_tablet_pad_mode_group_has_button(li_group, i)) {
diff --git a/examples/idle.c b/examples/idle.c
index 30e106db..87a03924 100644
--- a/examples/idle.c
+++ b/examples/idle.c
@@ -152,14 +152,20 @@ int main(int argc, char *argv[]) {
 		.display = display,
 	};
 
-	if (simulate_activity_timeout != 0 && simulate_activity_timeout < close_timeout) {
+	bool create_t1 = (simulate_activity_timeout != 0) &&
+	                (simulate_activity_timeout < close_timeout);
+
+	if (create_t1) {
 		if (pthread_create(&t1, NULL, &simulate_activity, (void *)&arg) != 0) {
 			return -1;
 		}
 	}
-	if (close_timeout != 0) {
+
+	bool create_t2 = (close_timeout != 0);
+
+	if (create_t2) {
 		if (pthread_create(&t2, NULL, &close_program, (void *)&arg) != 0) {
-			if (simulate_activity_timeout != 0) {
+			if (create_t1) {
 				pthread_cancel(t1);
 			}
 			return -1;
@@ -170,18 +176,19 @@ int main(int argc, char *argv[]) {
 	fprintf(stdout, "waiting\n");
 
 	if (pthread_create(&t3, NULL, &main_loop, (void *)display) != 0) {
-		if (simulate_activity_timeout != 0) {
+		if (create_t1) {
 			pthread_cancel(t1);
 		}
-		if (close_timeout != 0 ) {
+		if (create_t2) {
 			pthread_cancel(t2);
 		}
+		return -1;
 	}
 
-	if (simulate_activity_timeout != 0) {
+	if (create_t1) {
 		pthread_join(t1, NULL);
 	}
-	if (close_timeout != 0) {
+	if (create_t2) {
 		pthread_join(t2, NULL);
 	}
 	pthread_cancel(t3);
diff --git a/examples/meson.build b/examples/meson.build
index 0fb37a9e..b5ad6c98 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -20,31 +20,31 @@ endif
 examples = {
 	'simple': {
 		'src': 'simple.c',
-		'dep': wlroots,
+		'dep': [wlroots],
 	},
 	'pointer': {
 		'src': 'pointer.c',
-		'dep': wlroots,
+		'dep': [wlroots],
 	},
 	'touch': {
 		'src': ['touch.c', 'cat.c'],
-		'dep': wlroots,
+		'dep': [wlroots],
 	},
 	'tablet': {
 		'src': 'tablet.c',
-		'dep': wlroots,
+		'dep': [wlroots],
 	},
 	'rotation': {
 		'src': ['rotation.c', 'cat.c'],
-		'dep': wlroots,
+		'dep': [wlroots],
 	},
 	'multi-pointer': {
 		'src': 'multi-pointer.c',
-		'dep': wlroots,
+		'dep': [wlroots],
 	},
 	'output-layout': {
 		'src': ['output-layout.c', 'cat.c'],
-		'dep': wlroots,
+		'dep': [wlroots],
 	},
 	'screenshot': {
 		'src': 'screenshot.c',
@@ -93,10 +93,18 @@ examples = {
 }
 
 foreach name, info : examples
-	executable(
-		name,
-		info.get('src'),
-		dependencies: info.get('dep'),
-		build_by_default: get_option('examples'),
-	)
+	all_dep_found = true
+	foreach d : info.get('dep')
+		all_dep_found = all_dep_found and d.found()
+	endforeach
+	if all_dep_found
+		executable(
+			name,
+			info.get('src'),
+			dependencies: info.get('dep'),
+			build_by_default: get_option('examples'),
+		)
+	else
+		warning('Dependencies not satisfied for ' + name)
+	endif
 endforeach
diff --git a/include/rootston/desktop.h b/include/rootston/desktop.h
index 363a16f0..3496fb43 100644
--- a/include/rootston/desktop.h
+++ b/include/rootston/desktop.h
@@ -10,7 +10,6 @@
 #include <wlr/types/wlr_idle.h>
 #include <wlr/types/wlr_input_inhibitor.h>
 #include <wlr/types/wlr_layer_shell.h>
-#include <wlr/types/wlr_linux_dmabuf_v1.h>
 #include <wlr/types/wlr_list.h>
 #include <wlr/types/wlr_output_layout.h>
 #include <wlr/types/wlr_output.h>
@@ -53,7 +52,6 @@ struct roots_desktop {
 	struct wlr_idle *idle;
 	struct wlr_idle_inhibit_manager_v1 *idle_inhibit;
 	struct wlr_input_inhibit_manager *input_inhibit;
-	struct wlr_linux_dmabuf_v1 *linux_dmabuf;
 	struct wlr_layer_shell *layer_shell;
 	struct wlr_virtual_keyboard_manager_v1 *virtual_keyboard;
 	struct wlr_screencopy_manager_v1 *screencopy;
diff --git a/include/wlr/types/wlr_screencopy_v1.h b/include/wlr/types/wlr_screencopy_v1.h
index 822fb3d0..aba32a45 100644
--- a/include/wlr/types/wlr_screencopy_v1.h
+++ b/include/wlr/types/wlr_screencopy_v1.h
@@ -10,6 +10,7 @@
 #define WLR_TYPES_WLR_SCREENCOPY_V1_H
 
 #include <wayland-server.h>
+#include <wlr/types/wlr_box.h>
 
 struct wlr_screencopy_manager_v1 {
 	struct wl_global *global;
diff --git a/include/wlr/xwayland.h b/include/wlr/xwayland.h
index 2eda768a..cf1c2cd1 100644
--- a/include/wlr/xwayland.h
+++ b/include/wlr/xwayland.h
@@ -138,6 +138,7 @@ struct wlr_xwayland_surface {
 	struct wl_event_source *ping_timer;
 
 	// _NET_WM_STATE
+	bool modal;
 	bool fullscreen;
 	bool maximized_vert, maximized_horz;
 
@@ -150,6 +151,7 @@ struct wlr_xwayland_surface {
 		struct wl_signal request_resize;
 		struct wl_signal request_maximize;
 		struct wl_signal request_fullscreen;
+		struct wl_signal request_activate;
 
 		struct wl_signal map;
 		struct wl_signal unmap;
diff --git a/include/xwayland/xwm.h b/include/xwayland/xwm.h
index 08d37736..607cc797 100644
--- a/include/xwayland/xwm.h
+++ b/include/xwayland/xwm.h
@@ -40,6 +40,7 @@ enum atom_name {
 	_NET_WM_MOVERESIZE,
 	_NET_WM_NAME,
 	_NET_SUPPORTING_WM_CHECK,
+	_NET_WM_STATE_MODAL,
 	_NET_WM_STATE_FULLSCREEN,
 	_NET_WM_STATE_MAXIMIZED_VERT,
 	_NET_WM_STATE_MAXIMIZED_HORZ,
diff --git a/render/wlr_renderer.c b/render/wlr_renderer.c
index 6c2b9fbb..31bf2b18 100644
--- a/render/wlr_renderer.c
+++ b/render/wlr_renderer.c
@@ -1,10 +1,11 @@
 #include <assert.h>
 #include <stdbool.h>
 #include <stdlib.h>
+#include <wlr/render/gles2.h>
 #include <wlr/render/interface.h>
 #include <wlr/render/wlr_renderer.h>
+#include <wlr/types/wlr_linux_dmabuf_v1.h>
 #include <wlr/types/wlr_matrix.h>
-#include <wlr/render/gles2.h>
 #include <wlr/util/log.h>
 #include "util/signal.h"
 
@@ -176,6 +177,10 @@ void wlr_renderer_init_wl_display(struct wlr_renderer *r,
 		}
 	}
 
+	if (r->impl->texture_from_dmabuf) {
+		wlr_linux_dmabuf_v1_create(wl_display, r);
+	}
+
 	if (r->impl->init_wl_display) {
 		r->impl->init_wl_display(r, wl_display);
 	}
diff --git a/rootston/desktop.c b/rootston/desktop.c
index 658611e3..efb7581a 100644
--- a/rootston/desktop.c
+++ b/rootston/desktop.c
@@ -14,7 +14,6 @@
 #include <wlr/types/wlr_idle.h>
 #include <wlr/types/wlr_input_inhibitor.h>
 #include <wlr/types/wlr_layer_shell.h>
-#include <wlr/types/wlr_linux_dmabuf_v1.h>
 #include <wlr/types/wlr_output_layout.h>
 #include <wlr/types/wlr_primary_selection.h>
 #include <wlr/types/wlr_server_decoration.h>
@@ -893,9 +892,6 @@ struct roots_desktop *desktop_create(struct roots_server *server,
 	wl_signal_add(&desktop->input_inhibit->events.deactivate,
 			&desktop->input_inhibit_deactivate);
 
-	desktop->linux_dmabuf = wlr_linux_dmabuf_v1_create(server->wl_display,
-		server->renderer);
-
 	desktop->virtual_keyboard = wlr_virtual_keyboard_manager_v1_create(
 		server->wl_display);
 	wl_signal_add(&desktop->virtual_keyboard->events.new_virtual_keyboard,
diff --git a/rootston/output.c b/rootston/output.c
index d8edf1c2..8677f491 100644
--- a/rootston/output.c
+++ b/rootston/output.c
@@ -822,12 +822,6 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 		wlr_output->model, wlr_output->serial, wlr_output->phys_width,
 		wlr_output->phys_height);
 
-	if (!wl_list_empty(&wlr_output->modes)) {
-		struct wlr_output_mode *mode =
-			wl_container_of((&wlr_output->modes)->prev, mode, link);
-		wlr_output_set_mode(wlr_output, mode);
-	}
-
 	struct roots_output *output = calloc(1, sizeof(struct roots_output));
 	clock_gettime(CLOCK_MONOTONIC, &output->last_frame);
 	output->desktop = desktop;
@@ -856,22 +850,28 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 
 	struct roots_output_config *output_config =
 		roots_config_get_output(config, wlr_output);
+
+	if ((!output_config || output_config->enable) && !wl_list_empty(&wlr_output->modes)) {
+		struct wlr_output_mode *mode =
+			wl_container_of(wlr_output->modes.prev, mode, link);
+		wlr_output_set_mode(wlr_output, mode);
+	}
+
 	if (output_config) {
 		if (output_config->enable) {
-			struct roots_output_mode_config *mode_config;
-
 			if (wlr_output_is_drm(wlr_output)) {
+				struct roots_output_mode_config *mode_config;
 				wl_list_for_each(mode_config, &output_config->modes, link) {
 					wlr_drm_connector_add_mode(wlr_output, &mode_config->info);
 				}
-			} else {
-				if (!wl_list_empty(&output_config->modes)) {
-					wlr_log(WLR_ERROR, "Can only add modes for DRM backend");
-				}
+			} else if (!wl_list_empty(&output_config->modes)) {
+				wlr_log(WLR_ERROR, "Can only add modes for DRM backend");
 			}
+
 			if (output_config->mode.width) {
 				set_mode(wlr_output, output_config);
 			}
+
 			wlr_output_set_scale(wlr_output, output_config->scale);
 			wlr_output_set_transform(wlr_output, output_config->transform);
 			wlr_output_layout_add(desktop->layout, wlr_output, output_config->x,
diff --git a/rootston/xdg_shell.c b/rootston/xdg_shell.c
index fed9afcd..2cf2081e 100644
--- a/rootston/xdg_shell.c
+++ b/rootston/xdg_shell.c
@@ -507,8 +507,6 @@ static void decoration_handle_surface_commit(struct wl_listener *listener,
 }
 
 void handle_xdg_toplevel_decoration(struct wl_listener *listener, void *data) {
-	struct roots_desktop *desktop =
-		wl_container_of(listener, desktop, xdg_toplevel_decoration);
 	struct wlr_xdg_toplevel_decoration_v1 *wlr_decoration = data;
 
 	wlr_log(WLR_DEBUG, "new xdg toplevel decoration");
diff --git a/types/tablet_v2/wlr_tablet_v2_pad.c b/types/tablet_v2/wlr_tablet_v2_pad.c
index 1fcfa38e..a1672d28 100644
--- a/types/tablet_v2/wlr_tablet_v2_pad.c
+++ b/types/tablet_v2/wlr_tablet_v2_pad.c
@@ -368,7 +368,7 @@ struct wlr_tablet_v2_tablet_pad *wlr_tablet_pad_create(
 	}
 
 	pad->group_count = wl_list_length(&wlr_pad->groups);
-	pad->groups = calloc(pad->group_count, sizeof(int));
+	pad->groups = calloc(pad->group_count, sizeof(uint32_t));
 	if (!pad->groups) {
 		free(pad);
 		return NULL;
@@ -471,9 +471,9 @@ void wlr_send_tablet_v2_tablet_pad_button(
 
 void wlr_send_tablet_v2_tablet_pad_strip(struct wlr_tablet_v2_tablet_pad *pad,
 		uint32_t strip, double position, bool finger, uint32_t time) {
-	if (!pad->current_client &&
-			pad->current_client->strips &&
-			pad->current_client->strips[strip]) {
+	if (!pad->current_client ||
+			!pad->current_client->strips ||
+			!pad->current_client->strips[strip]) {
 		return;
 	}
 	struct wl_resource *resource = pad->current_client->strips[strip];
diff --git a/types/wlr_cursor.c b/types/wlr_cursor.c
index 82ad1a4a..49f11b20 100644
--- a/types/wlr_cursor.c
+++ b/types/wlr_cursor.c
@@ -332,7 +332,7 @@ static void handle_pointer_motion(struct wl_listener *listener, void *data) {
 
 static void apply_output_transform(double *x, double *y,
 		enum wl_output_transform transform) {
-	double dx = *x, dy = *y;
+	double dx = 0.0, dy = 0.0;
 	double width = 1.0, height = 1.0;
 
 	switch (transform) {
diff --git a/xwayland/xwm.c b/xwayland/xwm.c
index c939d8ea..cebd9bbc 100644
--- a/xwayland/xwm.c
+++ b/xwayland/xwm.c
@@ -39,6 +39,7 @@ const char *atom_map[ATOM_LAST] = {
 	"_NET_WM_MOVERESIZE",
 	"_NET_WM_NAME",
 	"_NET_SUPPORTING_WM_CHECK",
+	"_NET_WM_STATE_MODAL",
 	"_NET_WM_STATE_FULLSCREEN",
 	"_NET_WM_STATE_MAXIMIZED_VERT",
 	"_NET_WM_STATE_MAXIMIZED_HORZ",
@@ -147,6 +148,7 @@ static struct wlr_xwayland_surface *xwayland_surface_create(
 	wl_signal_init(&surface->events.request_resize);
 	wl_signal_init(&surface->events.request_maximize);
 	wl_signal_init(&surface->events.request_fullscreen);
+	wl_signal_init(&surface->events.request_activate);
 	wl_signal_init(&surface->events.map);
 	wl_signal_init(&surface->events.unmap);
 	wl_signal_init(&surface->events.set_class);
@@ -268,6 +270,9 @@ static void xsurface_set_net_wm_state(struct wlr_xwayland_surface *xsurface) {
 	int i;
 
 	i = 0;
+	if (xsurface->modal) {
+		property[i++] = xwm->atoms[_NET_WM_STATE_MODAL];
+	}
 	if (xsurface->fullscreen) {
 		property[i++] = xwm->atoms[_NET_WM_STATE_FULLSCREEN];
 	}
@@ -575,7 +580,9 @@ static void read_surface_net_wm_state(struct wlr_xwm *xwm,
 	xsurface->fullscreen = 0;
 	xcb_atom_t *atom = xcb_get_property_value(reply);
 	for (uint32_t i = 0; i < reply->value_len; i++) {
-		if (atom[i] == xwm->atoms[_NET_WM_STATE_FULLSCREEN]) {
+		if (atom[i] == xwm->atoms[_NET_WM_STATE_MODAL]) {
+			xsurface->modal = true;
+		} else if (atom[i] == xwm->atoms[_NET_WM_STATE_FULLSCREEN]) {
 			xsurface->fullscreen = true;
 		} else if (atom[i] == xwm->atoms[_NET_WM_STATE_MAXIMIZED_VERT]) {
 			xsurface->maximized_vert = true;
@@ -1028,7 +1035,10 @@ static void xwm_handle_net_wm_state_message(struct wlr_xwm *xwm,
 	for (size_t i = 0; i < 2; ++i) {
 		uint32_t property = client_message->data.data32[1 + i];
 
-		if (property == xwm->atoms[_NET_WM_STATE_FULLSCREEN] &&
+		if (property == xwm->atoms[_NET_WM_STATE_MODAL] &&
+				update_state(action, &xsurface->modal)) {
+			xsurface_set_net_wm_state(xsurface);
+		} else if (property == xwm->atoms[_NET_WM_STATE_FULLSCREEN] &&
 				update_state(action, &xsurface->fullscreen)) {
 			xsurface_set_net_wm_state(xsurface);
 		} else if (property == xwm->atoms[_NET_WM_STATE_MAXIMIZED_VERT] &&
@@ -1087,6 +1097,15 @@ static void xwm_handle_wm_protocols_message(struct wlr_xwm *xwm,
 	}
 }
 
+static void xwm_handle_net_active_window_message(struct wlr_xwm *xwm,
+		xcb_client_message_event_t *ev) {
+	struct wlr_xwayland_surface *surface = lookup_surface(xwm, ev->window);
+	if (surface == NULL) {
+		return;
+	}
+	wlr_signal_emit_safe(&surface->events.request_activate, surface);
+}
+
 static void xwm_handle_client_message(struct wlr_xwm *xwm,
 		xcb_client_message_event_t *ev) {
 	wlr_log(WLR_DEBUG, "XCB_CLIENT_MESSAGE (%u)", ev->window);
@@ -1099,6 +1118,8 @@ static void xwm_handle_client_message(struct wlr_xwm *xwm,
 		xwm_handle_net_wm_moveresize_message(xwm, ev);
 	} else if (ev->type == xwm->atoms[WM_PROTOCOLS]) {
 		xwm_handle_wm_protocols_message(xwm, ev);
+	} else if (ev->type == xwm->atoms[_NET_ACTIVE_WINDOW]) {
+		xwm_handle_net_active_window_message(xwm, ev);
 	} else if (!xwm_handle_selection_client_message(xwm, ev)) {
 		char *type_name = xwm_get_atom_name(xwm, ev->type);
 		wlr_log(WLR_DEBUG, "unhandled x11 client message %u (%s)", ev->type,
@@ -1630,6 +1651,7 @@ struct wlr_xwm *xwm_create(struct wlr_xwayland *wlr_xwayland) {
 		xwm->atoms[NET_WM_STATE],
 		xwm->atoms[_NET_ACTIVE_WINDOW],
 		xwm->atoms[_NET_WM_MOVERESIZE],
+		xwm->atoms[_NET_WM_STATE_MODAL],
 		xwm->atoms[_NET_WM_STATE_FULLSCREEN],
 		xwm->atoms[_NET_WM_STATE_MAXIMIZED_VERT],
 		xwm->atoms[_NET_WM_STATE_MAXIMIZED_HORZ],