[PATCH] ui: dbus-display requires CONFIG_GBM

[Paolo Bonzini]

Without CONFIG_GBM, compiling dbus-display fails with

../ui/dbus.c: In function ‘dbus_create_context’:
../ui/dbus.c:47:20: error: ‘qemu_egl_rn_ctx’ undeclared (first use in this 
function); did you mean ‘qemu_egl_init_ctx’?
   47 |                    qemu_egl_rn_ctx);
      |                    ^~~~~~~~~~~~~~~
      |                    qemu_egl_init_ctx
../ui/dbus.c:47:20: note: each undeclared identifier is reported only once for 
each function it appears in

and many other similar errors, because include/ui/egl-helpers.h only has
these declaration if gbm is found on the system.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 meson.build    | 4 ++--
 ui/meson.build | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/meson.build b/meson.build
index 9b67db0d67..38403d2892 100644
--- a/meson.build
+++ b/meson.build
@@ -1697,8 +1697,8 @@ dbus_display = get_option('dbus_display') \
            error_message: '-display dbus requires glib>=2.64') \
   .require(gdbus_codegen.found(),
            error_message: '-display dbus requires gdbus-codegen') \
-  .require(opengl.found(),
-           error_message: '-display dbus requires epoxy/egl') \
+  .require(opengl.found() and gbm.found(),
+           error_message: '-display dbus requires epoxy/egl and gbm') \
   .allowed()
 
 have_virtfs = get_option('virtfs') \
diff --git a/ui/meson.build b/ui/meson.build
index e9f48c5315..ec13949776 100644
--- a/ui/meson.build
+++ b/ui/meson.build
@@ -81,7 +81,7 @@ if dbus_display
                                           '--interface-prefix', 'org.qemu.',
                                           '--c-namespace', 'QemuDBus',
                                           '--generate-c-code', '@BASENAME@'])
-  dbus_ss.add(when: [gio, pixman, opengl],
+  dbus_ss.add(when: [gio, pixman, opengl, gbm],
               if_true: [files(
                 'dbus-chardev.c',
                 'dbus-clipboard.c',
-- 
2.36.1