Revert "Merge pull request #1194 from ascent12/meson_feature"

This breaks wlroots when used as a meson subproject.

This reverts commit dea311992eb4ff3e343c3cf5b0603034223d2a42, reversing
changes made to 6db9c4b74667c1d917d720f5e96985a2461569fb.

19 files changed, 227 insertions, 385 deletions

diff --git a/backend/meson.build b/backend/meson.build
index dd1f4df3..52abe64d 100644
--- a/backend/meson.build
+++ b/backend/meson.build
@@ -1,4 +1,3 @@
-backend_parts = []
 backend_files = files(
 	'backend.c',
 	'drm/atomic.c',
@@ -45,17 +44,28 @@ else
 	backend_files += files('session/direct.c')
 endif
 
-if logind.found()
+if conf_data.get('WLR_HAS_SYSTEMD', false)
 	backend_files += files('session/logind.c')
-	backend_deps += logind
+	backend_deps += systemd
 endif
 
-subdir('x11')
+if conf_data.get('WLR_HAS_X11_BACKEND', false)
+	backend_files += files(
+		'x11/backend.c',
+		'x11/input_device.c',
+		'x11/output.c',
+	)
+	backend_deps += xcb_xkb
+endif
+
+if conf_data.get('WLR_HAS_ELOGIND', false)
+	backend_files += files('session/logind.c')
+	backend_deps += elogind
+endif
 
 lib_wlr_backend = static_library(
 	'wlr_backend',
 	backend_files,
 	include_directories: wlr_inc,
-	link_whole: backend_parts,
 	dependencies: backend_deps,
 )
diff --git a/backend/x11/meson.build b/backend/x11/meson.build
deleted file mode 100644
index 1164df1e..00000000
--- a/backend/x11/meson.build
+++ /dev/null
@@ -1,44 +0,0 @@
-x11_libs = []
-x11_required = [
-	'xcb',
-	'x11-xcb',
-]
-x11_optional = [
-	'xcb-xkb',
-]
-
-foreach lib : x11_required
-	dep = dependency(lib, required: get_option('x11-backend'))
-	if not dep.found()
-		subdir_done()
-	endif
-
-	x11_libs += dep
-endforeach
-
-foreach lib : x11_optional
-	dep = dependency(lib, required: get_option(lib))
-	if dep.found()
-		x11_libs += dep
-		conf_data.set('WLR_HAS_' + lib.underscorify().to_upper(), true)
-	endif
-endforeach
-
-lib_wlr_backend_x11 = static_library(
-	'wlr_backend_x11',
-	files(
-		'backend.c',
-		'input_device.c',
-		'output.c',
-	),
-	include_directories: wlr_inc,
-	dependencies: [
-		wayland_server,
-		pixman,
-		xkbcommon,
-		x11_libs,
-	],
-)
-
-backend_parts += lib_wlr_backend_x11
-conf_data.set('WLR_HAS_X11_BACKEND', true)
diff --git a/examples/meson.build b/examples/meson.build
index 0fb37a9e..25ad7566 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -1,102 +1,80 @@
 threads = dependency('threads')
 wayland_cursor = dependency('wayland-cursor')
+
 libpng = dependency('libpng', required: false)
+
 # These versions correspond to ffmpeg 4.0
 libavutil = dependency('libavutil', version: '>=56.14.100', required: false)
 libavcodec = dependency('libavcodec', version: '>=58.18.100', required: false)
 libavformat = dependency('libavformat', version: '>=58.12.100', required: false)
 
-# Small hack until https://github.com/mesonbuild/meson/pull/3386/ is merged
-foreach dep : ['libpng', 'libavutil', 'libavcodec', 'libavformat']
-	if not get_variable(dep).found()
-		set_variable(dep, disabler())
-	endif
-endforeach
-
 if not cc.has_header('libavutil/hwcontext_drm.h', dependencies: libavutil)
-	libavutil = disabler()
+    libavutil = disabler()
 endif
 
-examples = {
-	'simple': {
-		'src': 'simple.c',
-		'dep': wlroots,
-	},
-	'pointer': {
-		'src': 'pointer.c',
-		'dep': wlroots,
-	},
-	'touch': {
-		'src': ['touch.c', 'cat.c'],
-		'dep': wlroots,
-	},
-	'tablet': {
-		'src': 'tablet.c',
-		'dep': wlroots,
-	},
-	'rotation': {
-		'src': ['rotation.c', 'cat.c'],
-		'dep': wlroots,
-	},
-	'multi-pointer': {
-		'src': 'multi-pointer.c',
-		'dep': wlroots,
-	},
-	'output-layout': {
-		'src': ['output-layout.c', 'cat.c'],
-		'dep': wlroots,
-	},
-	'screenshot': {
-		'src': 'screenshot.c',
-		'dep': [wayland_client, wlr_protos, wlroots],
-	},
-	'idle': {
-		'src': 'idle.c',
-		'dep': [wayland_client, wlr_protos, wlroots, threads],
-	},
-	'idle-inhibit': {
-		'src': 'idle-inhibit.c',
-		'dep': [wayland_client, wlr_protos, wlroots],
-	},
-	'layer-shell': {
-		'src': 'layer-shell.c',
-		'dep': [wayland_client, wayland_cursor, wlr_protos, wlroots],
-	},
-	'input-inhibitor': {
-		'src': 'input-inhibitor.c',
-		'dep': [wayland_client, wayland_cursor, wlr_protos, wlroots],
-	},
-	'gamma-control': {
-		'src': 'gamma-control.c',
-		'dep': [wayland_client, wayland_cursor, wlr_protos, wlroots],
-	},
-	'dmabuf-capture': {
-		'src': 'dmabuf-capture.c',
-		'dep': [
-			libavcodec,
-			libavformat,
-			libavutil,
-			threads,
-			wayland_client,
-			wlr_protos,
-			wlroots,
-		],
-	},
-	'screencopy': {
-		'src': 'screencopy.c',
-		'dep': [libpng, wayland_client, wlr_protos, wlroots],
-	},
-	'toplevel-decoration': {
-		'src': 'toplevel-decoration.c',
-		'dep': [wayland_client, wlr_protos, wlroots],
-	},
-}
+executable('simple', 'simple.c', dependencies: wlroots)
+executable('pointer', 'pointer.c', dependencies: wlroots)
+executable('touch', 'touch.c', 'cat.c', dependencies: wlroots)
+executable('tablet', 'tablet.c', dependencies: wlroots)
+executable('rotation', 'rotation.c', 'cat.c', dependencies: wlroots)
+executable('multi-pointer', 'multi-pointer.c', dependencies: wlroots)
+executable('output-layout', 'output-layout.c', 'cat.c', dependencies: wlroots)
+
+executable(
+	'screenshot',
+	'screenshot.c',
+	dependencies: [wayland_client, wlr_protos, wlroots]
+)
+
+executable(
+	'idle',
+	'idle.c',
+	dependencies: [wayland_client, wlr_protos, wlroots, threads]
+)
+
+executable(
+	'idle-inhibit',
+	'idle-inhibit.c',
+	dependencies: [wayland_client, wlr_protos, wlroots, threads]
+)
+
+executable(
+	'layer-shell',
+	'layer-shell.c',
+	dependencies: [wayland_cursor, wayland_client, wlr_protos, wlroots]
+)
+
+executable(
+	'input-inhibitor',
+	'input-inhibitor.c',
+	dependencies: [wayland_cursor, wayland_client, wlr_protos, wlroots]
+)
 
-foreach name, info : examples
+executable(
+	'gamma-control',
+	'gamma-control.c',
+	dependencies: [wayland_cursor, wayland_client, wlr_protos, wlroots]
+)
+
+if libavutil.found() and libavcodec.found() and libavformat.found()
 	executable(
-		name,
-		info.get('src'),
-		dependencies: info.get('dep'),
-		build_by_default: get_option('examples'),
+		'dmabuf-capture',
+		'dmabuf-capture.c',
+		dependencies: [wayland_client, wlr_protos, libavutil, libavcodec,
+				libavformat, wlroots, threads ]
 	)
-endforeach
+endif
+
+if libpng.found()
+	executable(
+		'screencopy',
+		'screencopy.c',
+		dependencies: [wayland_client, wlr_protos, wlroots, libpng]
+	)
+endif
+
+executable(
+	'toplevel-decoration',
+	'toplevel-decoration.c',
+	dependencies: [wayland_client, wlr_protos, wlroots]
+)
diff --git a/glgen.sh b/glgen.sh
index b27750e4..0356cf98 100755
--- a/glgen.sh
+++ b/glgen.sh
@@ -66,6 +66,7 @@ cat > $OUT_H << EOF
 
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
+#include <EGL/eglmesaext.h>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
diff --git a/include/wlr/backend/meson.build b/include/wlr/backend/meson.build
deleted file mode 100644
index e005b854..00000000
--- a/include/wlr/backend/meson.build
+++ /dev/null
@@ -1,16 +0,0 @@
-install_headers(
-	'drm.h',
-	'headless.h',
-	'interface.h',
-	'libinput.h',
-	'multi.h',
-	'session.h',
-	'wayland.h',
-	subdir: 'wlr/backend',
-)
-
-if conf_data.get('WLR_HAS_X11_BACKEND', false)
-	install_headers('x11.h', subdir: 'wlr/backend')
-endif
-
-subdir('session')
diff --git a/include/wlr/backend/session/meson.build b/include/wlr/backend/session/meson.build
deleted file mode 100644
index 21b5a96b..00000000
--- a/include/wlr/backend/session/meson.build
+++ /dev/null
@@ -1 +0,0 @@
-install_headers('interface.h', subdir: 'wlr/backend/session')
diff --git a/include/wlr/config.h.in b/include/wlr/config.h.in
deleted file mode 100644
index 750ad3b7..00000000
--- a/include/wlr/config.h.in
+++ /dev/null
@@ -1,19 +0,0 @@
-#ifndef WLR_CONFIG_H
-#define WLR_CONFIG_H
-
-#mesondefine WLR_HAS_LIBCAP
-
-#mesondefine WLR_HAS_SYSTEMD
-#mesondefine WLR_HAS_ELOGIND
-
-#mesondefine WLR_HAS_X11_BACKEND
-
-#mesondefine WLR_HAS_XWAYLAND
-
-#mesondefine WLR_HAS_XCB_ERRORS
-#mesondefine WLR_HAS_XCB_ICCCM
-#mesondefine WLR_HAS_XCB_XKB
-
-#mesondefine WLR_HAS_POSIX_FALLOCATE
-
-#endif
diff --git a/include/wlr/interfaces/meson.build b/include/wlr/interfaces/meson.build
deleted file mode 100644
index 207896b5..00000000
--- a/include/wlr/interfaces/meson.build
+++ /dev/null
@@ -1,10 +0,0 @@
-install_headers(
-	'wlr_input_device.h',
-	'wlr_keyboard.h',
-	'wlr_output.h',
-	'wlr_pointer.h',
-	'wlr_tablet_pad.h',
-	'wlr_tablet_tool.h',
-	'wlr_touch.h',
-	subdir: 'wlr/interfaces',
-)
diff --git a/include/wlr/meson.build b/include/wlr/meson.build
index 43b5aec9..6259c311 100644
--- a/include/wlr/meson.build
+++ b/include/wlr/meson.build
@@ -4,23 +4,11 @@ version_data.set_quoted('WLR_VERSION_STR',   meson.project_version())
 version_data.set('WLR_VERSION_MAJOR',        version_array[0])
 version_data.set('WLR_VERSION_MINOR',        version_array[1])
 version_data.set('WLR_VERSION_MICRO',        version_array[2])
+version_data.set('WLR_VERSION_NUM',          '(WLR_VERSION_MAJOR << 16) | (WLR_VERSION_MINOR << 8) | WLR_VERSION_MICRO')
 version_data.set('WLR_VERSION_API_CURRENT',  so_version[0])
 version_data.set('WLR_VERSION_API_REVISION', so_version[1])
 version_data.set('WLR_VERSION_API_AGE',      so_version[2])
 
-install_headers(
-	configure_file(input: 'config.h.in', output: 'config.h',configuration: conf_data),
-	configure_file(input: 'version.h.in', output: 'version.h', configuration: version_data),
-	'backend.h',
-	'xcursor.h',
-	subdir: 'wlr'
-)
-if conf_data.get('WLR_HAS_XWAYLAND', false)
-	install_headers('xwayland.h', subdir: 'wlr')
-endif
-
-subdir('backend')
-subdir('interfaces')
-subdir('render')
-subdir('types')
-subdir('util')
+wlr_inc_dest = join_paths(get_option('includedir'), 'wlr')
+configure_file(output: 'config.h',  install_dir: wlr_inc_dest, configuration: conf_data)
+configure_file(output: 'version.h', install_dir: wlr_inc_dest, configuration: version_data)
diff --git a/include/wlr/render/meson.build b/include/wlr/render/meson.build
deleted file mode 100644
index 05127bb7..00000000
--- a/include/wlr/render/meson.build
+++ /dev/null
@@ -1,9 +0,0 @@
-install_headers(
-	'dmabuf.h',
-	'egl.h',
-	'gles2.h',
-	'interface.h',
-	'wlr_renderer.h',
-	'wlr_texture.h',
-	subdir: 'wlr/render'
-)
diff --git a/include/wlr/types/meson.build b/include/wlr/types/meson.build
deleted file mode 100644
index 8c81cb0e..00000000
--- a/include/wlr/types/meson.build
+++ /dev/null
@@ -1,42 +0,0 @@
-install_headers(
-	'wlr_box.h',
-	'wlr_buffer.h',
-	'wlr_compositor.h',
-	'wlr_cursor.h',
-	'wlr_data_device.h',
-	'wlr_export_dmabuf_v1.h',
-	'wlr_gamma_control.h',
-	'wlr_gamma_control_v1.h',
-	'wlr_idle.h',
-	'wlr_idle_inhibit_v1.h',
-	'wlr_input_device.h',
-	'wlr_input_inhibitor.h',
-	'wlr_keyboard.h',
-	'wlr_layer_shell.h',
-	'wlr_linux_dmabuf_v1.h',
-	'wlr_list.h',
-	'wlr_matrix.h',
-	'wlr_output.h',
-	'wlr_output_damage.h',
-	'wlr_output_layout.h',
-	'wlr_pointer.h',
-	'wlr_primary_selection.h',
-	'wlr_region.h',
-	'wlr_screencopy_v1.h',
-	'wlr_screenshooter.h',
-	'wlr_seat.h',
-	'wlr_server_decoration.h',
-	'wlr_surface.h',
-	'wlr_tablet_pad.h',
-	'wlr_tablet_tool.h',
-	'wlr_tablet_v2.h',
-	'wlr_touch.h',
-	'wlr_virtual_keyboard_v1.h',
-	'wlr_wl_shell.h',
-	'wlr_xcursor_manager.h',
-	'wlr_xdg_decoration_v1.h',
-	'wlr_xdg_output.h',
-	'wlr_xdg_shell.h',
-	'wlr_xdg_shell_v6.h',
-	subdir: 'wlr/types',
-)
diff --git a/include/wlr/util/meson.build b/include/wlr/util/meson.build
deleted file mode 100644
index ee72cbd6..00000000
--- a/include/wlr/util/meson.build
+++ /dev/null
@@ -1,6 +0,0 @@
-install_headers(
-	'edges.h',
-	'log.h',
-	'region.h',
-	subdir: 'wlr/util',
-)
diff --git a/include/wlr/version.h.in b/include/wlr/version.h.in
deleted file mode 100644
index cdc0fd75..00000000
--- a/include/wlr/version.h.in
+++ /dev/null
@@ -1,16 +0,0 @@
-#ifndef WLR_VERSION_H
-#define WLR_VERSION_H
-
-#mesondefine WLR_VERSION_STR
-
-#mesondefine WLR_VERSION_MAJOR
-#mesondefine WLR_VERSION_MINOR
-#mesondefine WLR_VERSION_MICRO
-
-#define WLR_VERSION_NUM ((WLR_VERSION_MAJOR << 16) | (WLR_VERSION_MINOR << 8) | WLR_VERSION_MICRO)
-
-#mesondefine WLR_VERSION_API_CURRENT
-#mesondefine WLR_VERSION_API_REVISION
-#mesondefine WLR_VERSION_API_AGE
-
-#endif
diff --git a/meson.build b/meson.build
index 8458a66c..655eb52d 100644
--- a/meson.build
+++ b/meson.build
@@ -3,7 +3,7 @@ project(
 	'c',
 	version: '0.0.1',
 	license: 'MIT',
-	meson_version: '>=0.47.0',
+	meson_version: '>=0.44.0',
 	default_options: [
 		'c_std=c11',
 		'warning_level=2',
@@ -18,7 +18,15 @@ so_version = ['0', '0', '0']
 
 add_project_arguments('-Wno-unused-parameter', language: 'c')
 add_project_arguments(
-	'-DWLR_SRC_DIR="@0@"'.format(meson.current_source_dir()),
+	'-DWLR_SRC_DIR="@0@"'.format(meson.source_root()),
+	language: 'c',
+)
+add_project_arguments(
+	'-I@0@'.format(meson.build_root()),
+	language: 'c',
+)
+add_project_link_arguments(
+	'-Wl,-rpath,@0@'.format(meson.build_root()),
 	language: 'c',
 )
 add_project_arguments(
@@ -28,7 +36,7 @@ add_project_arguments(
 
 conf_data = configuration_data()
 
-wlr_inc = include_directories('.', 'include')
+wlr_inc = include_directories('include')
 
 cc = meson.get_compiler('c')
 
@@ -54,37 +62,90 @@ libinput       = dependency('libinput', version: '>=1.7.0')
 xkbcommon      = dependency('xkbcommon')
 udev           = dependency('libudev')
 pixman         = dependency('pixman-1')
-libcap         = dependency('libcap', required: get_option('libcap'))
-logind         = dependency('lib' + get_option('logind-provider'), required: get_option('logind'))
+libcap         = dependency('libcap', required: get_option('enable-libcap') == 'true')
+systemd        = dependency('libsystemd', required: get_option('enable-systemd') == 'true')
+elogind        = dependency('libelogind', required: get_option('enable-elogind') == 'true')
 math           = cc.find_library('m', required: false)
 
+exclude_headers = []
 wlr_parts = []
 wlr_deps = []
 
-if libcap.found()
+if libcap.found() and get_option('enable-libcap') != 'false'
 	conf_data.set('WLR_HAS_LIBCAP', true)
 	wlr_deps += libcap
 endif
 
-if logind.found()
-	conf_data.set('WLR_HAS_' + get_option('logind-provider').to_upper(), true)
-	wlr_deps += logind
+if systemd.found() and get_option('enable-systemd') != 'false'
+	conf_data.set('WLR_HAS_SYSTEMD', true)
+	wlr_deps += systemd
+endif
+
+if elogind.found() and get_option('enable-elogind') != 'false'
+	conf_data.set('WLR_HAS_ELOGIND', true)
+endif
+
+if get_option('enable-x11_backend') or get_option('enable-xwayland')
+	xcb            = dependency('xcb')
+	xcb_composite  = dependency('xcb-composite')
+	xcb_xfixes     = dependency('xcb-xfixes')
+	xcb_image      = dependency('xcb-image')
+	xcb_render     = dependency('xcb-render')
+	x11_xcb        = dependency('x11-xcb')
+
+	xcb_icccm      = dependency('xcb-icccm', required: false)
+	xcb_xkb        = dependency('xcb-xkb', required: false)
+	xcb_errors     = dependency('xcb-errors', required: get_option('enable-xcb_errors') == 'true')
+
+	if xcb_icccm.found()
+		conf_data.set('WLR_HAS_XCB_ICCCM', true)
+	endif
+
+	if xcb_xkb.found()
+		conf_data.set('WLR_HAS_XCB_XKB', true)
+	endif
+
+	if xcb_errors.found() and get_option('enable-xcb_errors') != 'false'
+		conf_data.set('WLR_HAS_XCB_ERRORS', true)
+	endif
+
+	wlr_deps += [
+		xcb,
+		xcb_composite,
+		x11_xcb,
+	]
+else
+	add_project_arguments('-DMESA_EGL_NO_X11_HEADERS', language: 'c')
+endif
+
+if get_option('enable-x11_backend')
+	conf_data.set('WLR_HAS_X11_BACKEND', true)
+endif
+
+if get_option('enable-xwayland')
+	subdir('xwayland')
+	wlr_parts += [lib_wlr_xwayland]
+	conf_data.set('WLR_HAS_XWAYLAND', true)
+else
+	exclude_headers += 'xwayland.h'
 endif
 
 if cc.has_header_symbol('fcntl.h', 'posix_fallocate', prefix: '#define _POSIX_C_SOURCE 200112L')
 	conf_data.set('WLR_HAS_POSIX_FALLOCATE', true)
 endif
 
+includedir = get_option('includedir')
+exclude_headers += 'meson.build'
+install_subdir('include/wlr', install_dir: includedir, exclude_files: exclude_headers)
+
+
+subdir('include')
 subdir('protocol')
 subdir('render')
-
 subdir('backend')
 subdir('types')
 subdir('util')
 subdir('xcursor')
-subdir('xwayland')
-
-subdir('include')
 
 wlr_parts += [
 	lib_wl_protos,
@@ -121,7 +182,6 @@ lib_wlr = library(
 	include_directories: wlr_inc,
 	install: true,
 	link_args : symbols_flag,
-	link_depends: symbols_file,
 )
 
 wlroots = declare_dependency(
@@ -130,6 +190,7 @@ wlroots = declare_dependency(
 	include_directories: wlr_inc,
 )
 
+
 summary = [
 	'',
 	'----------------',
@@ -147,8 +208,14 @@ summary = [
 ]
 message('\n'.join(summary))
 
-subdir('examples')
-subdir('rootston')
+
+if get_option('enable-rootston')
+	subdir('rootston')
+endif
+
+if get_option('enable-examples')
+	subdir('examples')
+endif
 
 pkgconfig = import('pkgconfig')
 pkgconfig.generate(
@@ -163,31 +230,26 @@ git = find_program('git', required: false)
 if git.found()
 	all_files = run_command(
 		git,
-		'--git-dir=@0@/.git'.format(meson.current_source_dir()),
-		'ls-files',
-		':/*.[ch]',
-	)
+		['--git-dir=@0@/.git'.format(meson.current_source_dir()),
+		 'ls-files',
+		 ':/*.[ch]'])
 	all_files = files(all_files.stdout().split())
 
 	etags = find_program('etags', required: false)
 	if etags.found() and all_files.length() > 0
-		custom_target(
-			'etags',
+		custom_target('etags',
 			build_by_default: true,
 			input: all_files,
 			output: 'TAGS',
-			command: [etags, '-o', '@OUTPUT@', '@INPUT@'],
-		)
+			command: [etags.path(), '-o', 'TAGS'] + all_files)
 	endif
 
 	ctags = find_program('ctags', required: false)
 	if ctags.found() and all_files.length() > 0
-		custom_target(
-			'ctags',
+		custom_target('ctags',
 			build_by_default: true,
 			input: all_files,
 			output: 'tags',
-			command: [ctags, '-f', '@OUTPUT@', '@INPUT@'],
-		)
+			command: [ctags.path(), '-f', 'tags'] + all_files)
 	endif
 endif
diff --git a/meson_options.txt b/meson_options.txt
index 360c6f6a..e474b8aa 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,10 +1,8 @@
-option('libcap', type: 'feature', value: 'auto', description: 'Enable support for rootless session via capabilities (cap_sys_admin)')
-option('logind', type: 'feature', value: 'auto', description: 'Enable support for rootless session via logind')
-option('logind-provider', type: 'combo', choices: ['systemd', 'elogind'], value: 'systemd', description: 'Provider of logind support library')
-option('xcb-errors', type: 'feature', value: 'auto', description: 'Use xcb-errors util library')
-option('xcb-icccm', type: 'feature', value: 'auto', description: 'Use xcb-icccm util library')
-option('xcb-xkb', type: 'feature', value: 'auto', description: 'Use xcb-xkb util library')
-option('xwayland', type: 'feature', value: 'auto', description: 'Enable support for X11 applications')
-option('x11-backend', type: 'feature', value: 'auto', description: 'Enable X11 backend')
-option('rootston', type: 'boolean', value: true, description: 'Build the rootston example compositor')
-option('examples', type: 'boolean', value: true, description: 'Build example applications')
+option('enable-libcap', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Enable support for capabilities')
+option('enable-systemd', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Enable support for logind')
+option('enable-elogind', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Enable support for logind')
+option('enable-xcb_errors', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Use xcb-errors util library')
+option('enable-xwayland', type: 'boolean', value: true, description: 'Enable support X11 applications')
+option('enable-x11_backend', type: 'boolean', value: true, description: 'Enable X11 backend')
+option('enable-rootston', type: 'boolean', value: true, description: 'Build the rootston example compositor')
+option('enable-examples', type: 'boolean', value: true, description: 'Build example applications')
diff --git a/protocol/meson.build b/protocol/meson.build
index 2d2a73ed..73a3156a 100644
--- a/protocol/meson.build
+++ b/protocol/meson.build
@@ -1,15 +1,32 @@
 wl_protocol_dir = wayland_protos.get_pkgconfig_variable('pkgdatadir')
 
-wayland_scanner_dep = dependency('wayland-scanner', required: false, native: true)
-if wayland_scanner_dep.found()
-	wayland_scanner = find_program(
-		wayland_scanner_dep.get_pkgconfig_variable('wayland_scanner'),
-		native: true,
-	)
+wayland_scanner = find_program('wayland-scanner')
+
+wayland_scanner_server = generator(
+	wayland_scanner,
+	output: '@BASENAME@-protocol.h',
+	arguments: ['server-header', '@INPUT@', '@OUTPUT@'],
+)
+
+# should check wayland_scanner's version, but it is hard to get
+if wayland_server.version().version_compare('>=1.14.91')
+	code_type = 'private-code'
 else
-	wayland_scanner = find_program('wayland-scanner', native: true)
+	code_type = 'code'
 endif
 
+wayland_scanner_code = generator(
+	wayland_scanner,
+	output: '@BASENAME@-protocol.c',
+	arguments: [code_type, '@INPUT@', '@OUTPUT@'],
+)
+
+wayland_scanner_client = generator(
+	wayland_scanner,
+	output: '@BASENAME@-client-protocol.h',
+	arguments: ['client-header', '@INPUT@', '@OUTPUT@'],
+)
+
 protocols = [
 	[wl_protocol_dir, 'stable/xdg-shell/xdg-shell.xml'],
 	[wl_protocol_dir, 'unstable/idle-inhibit/idle-inhibit-unstable-v1.xml'],
@@ -50,35 +67,17 @@ wl_protos_headers = []
 
 foreach p : protocols
 	xml = join_paths(p)
-	wl_protos_src += custom_target(
-		xml.underscorify() + '_server_c',
-		input: xml,
-		output: '@BASENAME@-protocol.c',
-		command: [wayland_scanner, 'private-code', '@INPUT@', '@OUTPUT@'],
-	)
-	wl_protos_headers += custom_target(
-		xml.underscorify() + '_server_h',
-		input: xml,
-		output: '@BASENAME@-protocol.h',
-		command: [wayland_scanner, 'server-header', '@INPUT@', '@OUTPUT@'],
-	)
+	wl_protos_src += wayland_scanner_code.process(xml)
+	wl_protos_headers += wayland_scanner_server.process(xml)
 endforeach
 
 foreach p : client_protocols
 	xml = join_paths(p)
-	wl_protos_headers += custom_target(
-		xml.underscorify() + '_client_h',
-		input: xml,
-		output: '@BASENAME@-client-protocol.h',
-		command: [wayland_scanner, 'client-header', '@INPUT@', '@OUTPUT@'],
-	)
+	wl_protos_headers += wayland_scanner_client.process(xml)
 endforeach
 
-lib_wl_protos = static_library(
-	'wl_protos',
-	wl_protos_src + wl_protos_headers,
-	dependencies: wayland_client.partial_dependency(includes: true),
-)
+lib_wl_protos = static_library('wl_protos', wl_protos_src + wl_protos_headers,
+	dependencies: [wayland_client]) # for the include directory
 
 wlr_protos = declare_dependency(
 	link_with: lib_wl_protos,
diff --git a/render/meson.build b/render/meson.build
index c5401d22..4b90c229 100644
--- a/render/meson.build
+++ b/render/meson.build
@@ -1,7 +1,6 @@
 glgen = find_program('../glgen.sh')
 
-glapi = custom_target(
-	'glapi',
+glapi = custom_target('glapi',
 	input: 'glapi.txt',
 	output: ['@BASENAME@.c', '@BASENAME@.h'],
 	command: [glgen, '@INPUT@', '@OUTPUT0@', '@OUTPUT1@'],
@@ -20,7 +19,8 @@ lib_wlr_render = static_library(
 		'wlr_renderer.c',
 		'wlr_texture.c',
 	),
-	glapi,
+	glapi[0],
+	glapi[1],
 	include_directories: wlr_inc,
 	dependencies: [egl, glesv2, pixman, wayland_server],
 )
diff --git a/rootston/meson.build b/rootston/meson.build
index 9d1decce..8ab872b5 100644
--- a/rootston/meson.build
+++ b/rootston/meson.build
@@ -11,17 +11,12 @@ sources = [
 	'seat.c',
 	'virtual_keyboard.c',
 	'wl_shell.c',
-	'xdg_shell.c',
 	'xdg_shell_v6.c',
+	'xdg_shell.c',
 ]
-
-if conf_data.get('WLR_HAS_XWAYLAND', false)
-	sources += 'xwayland.c'
+if get_option('enable-xwayland')
+	sources += ['xwayland.c']
 endif
-
 executable(
-	'rootston',
-	sources,
-	dependencies: [wlroots, wlr_protos, pixman],
-	build_by_default: get_option('rootston'),
+	'rootston', sources, dependencies: [wlroots, wlr_protos, pixman]
 )
diff --git a/xwayland/meson.build b/xwayland/meson.build
index 0bd88924..ec486f58 100644
--- a/xwayland/meson.build
+++ b/xwayland/meson.build
@@ -1,32 +1,3 @@
-xwayland_libs = []
-xwayland_required = [
-	'xcb',
-	'xcb-composite',
-	'xcb-render',
-	'xcb-xfixes',
-]
-xwayland_optional = [
-	'xcb-errors',
-	'xcb-icccm',
-]
-
-foreach lib : xwayland_required
-	dep = dependency(lib, required: get_option('xwayland'))
-	if not dep.found()
-		subdir_done()
-	endif
-
-	xwayland_libs += dep
-endforeach
-
-foreach lib : xwayland_optional
-	dep = dependency(lib, required: get_option(lib))
-	if dep.found()
-		xwayland_libs += dep
-		conf_data.set('WLR_HAS_' + lib.underscorify().to_upper(), true)
-	endif
-endforeach
-
 lib_wlr_xwayland = static_library(
 	'wlr_xwayland',
 	files(
@@ -41,11 +12,14 @@ lib_wlr_xwayland = static_library(
 	include_directories: wlr_inc,
 	dependencies: [
 		wayland_server,
-		xwayland_libs,
+		xcb,
+		xcb_composite,
+		xcb_xfixes,
+		xcb_image,
+		xcb_render,
+		xcb_icccm,
+		xcb_errors,
 		xkbcommon,
 		pixman,
 	],
 )
-
-wlr_parts += lib_wlr_xwayland
-conf_data.set('WLR_HAS_XWAYLAND', true)