No udisks2 on OpenBSD (XXX add HAVE_UDISKS2 to meson_options.txt)               

Index: panels/system/meson.build
--- panels/system/meson.build.orig
+++ panels/system/meson.build
@@ -100,7 +100,7 @@ sources += gnome.mkenums(
 libsecret_dep = dependency('libsecret-1')
 gnutls_dep = dependency('gnutls')
 libgtop2 = dependency('libgtop-2.0')
-udisks2 = dependency('udisks2', version: '>= 2.8.2')
+udisks2 = []
 
 # Kerberos support
 krb_dep = dependency('krb5', required: false)