Index: mkconfig.rb
===================================================================
--- mkconfig.rb	(revision 25492)
+++ mkconfig.rb	(working copy)
@@ -76,7 +76,6 @@
     next if $install_name and /^RUBY_INSTALL_NAME$/ =~ name
     next if $so_name and /^RUBY_SO_NAME$/ =~  name
     next if /^(?:X|(?:MINI|RUN)RUBY$)/ =~ name
-    next if /^build/ =~ name
     if /^program_transform_name$/ =~ name and /^s(\\?.)(.*)\1$/ =~ val
       next if $install_name
       sep = %r"#{Regexp.quote($1)}"