diff -uNr sup-0.21.0/ext/mkrf_conf_xapian.rb sup-0.21.0p/ext/mkrf_conf_xapian.rb
--- sup-0.21.0/ext/mkrf_conf_xapian.rb	2015-05-01 11:33:02.331805203 +0530
+++ sup-0.21.0p/ext/mkrf_conf_xapian.rb	2015-05-01 11:40:07.496788064 +0530
@@ -13,7 +13,7 @@
 inst = Gem::DependencyInstaller.new
 begin
 
-  if !RbConfig::CONFIG['arch'].include?('openbsd')
+  if RbConfig::CONFIG['arch'].include?('openbsd')
     # update version in Gemfile as well
     name    = "xapian-ruby"
     version = "~> 1.2.15"