ext/etc/extconf.rb in etc-1.0.0 vs ext/etc/extconf.rb in etc-1.0.1

@@ -39,8 +39,12 @@
 have_struct_member('struct passwd', 'pw_comment', 'pwd.h') unless /cygwin/ === RUBY_PLATFORM
 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')
 
+srcdir = File.expand_path("..", __FILE__)
+if !File.exists?("#{srcdir}/constdefs.h")
+  %x[#{RbConfig.ruby} #{srcdir}/mkconstants.rb -o #{srcdir}/constdefs.h]
+end
 $distcleanfiles << "constdefs.h"
 
 create_makefile("etc")