Retry r65211.

* Maybe, RbConfig.ruby only provides after Ruby installation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65224 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/etc/extconf.rb

@@ -41,6 +41,12 @@ have_struct_member('struct passwd', 'pw_expire', 'pwd.h')
 have_struct_member('struct passwd', 'pw_passwd', 'pwd.h')
 have_struct_member('struct group', 'gr_passwd', 'grp.h')
 
+# for https://github.com/ruby/etc
+srcdir = File.expand_path("..", __FILE__)
+if !File.exist?("#{srcdir}/depend")
+  %x[#{RbConfig.ruby} #{srcdir}/mkconstants.rb -o #{srcdir}/constdefs.h]
+end
+
 $distcleanfiles << "constdefs.h"
 
 create_makefile("etc")