Index: sys/va/meson.build
--- sys/va/meson.build.orig
+++ sys/va/meson.build
@@ -89,7 +89,7 @@ plugin_sources += {
   'va': pathsep.join(doc_sources)
 }
 
-if host_system not in ['linux', 'windows']
+if host_system not in ['linux', 'windows', 'openbsd']
   subdir_done()
 endif
 
@@ -110,7 +110,7 @@ extra_args = [
 extra_dep = []
 c_std_arg = ['c_std=c99']
 
-if host_system == 'linux'
+if host_system in ['linux', 'openbsd']
   libgudev_dep = dependency('gudev-1.0', required: get_option('udev'), allow_fallback: true)
   if libgudev_dep.found()
     extra_args += ['-DHAVE_GUDEV']
