1 files changed, 1 insertions, 0 deletions
diff --git a/tool/mkconfig.rb b/tool/mkconfig.rb
index ca1f46713a..846b6ab880 100755
--- a/tool/mkconfig.rb
+++ b/tool/mkconfig.rb
@@ -77,6 +77,7 @@ File.foreach "config.status" do |line|
     when /^RUBY_SO_NAME$/; next if $so_name
     when /^arch$/; if val.empty? then val = arch else arch = val end
     when /^sitearch/; val = '$(arch)' if val.empty?
+    when /^build/; next
     end
     case val
     when /^\$\(ac_\w+\)$/; next