extconf.rb in games_dice-0.3.6

- old
+ new

@@ -1,3 +1,25 @@
 # ext/games_dice/extconf.rb
-require 'mkmf'
-create_makefile( 'games_dice/games_dice' )
+can_compile_extensions = false
+want_extensions = true
+
+begin
+  require 'mkmf'
+  can_compile_extensions = true
+rescue Exception
+  # This will appear only in verbose mode.
+  $stderr.puts "Could not require 'mkmf'. Not fatal: The extensions are optional."
+end
+
+
+if can_compile_extensions && want_extensions
+  create_makefile( 'games_dice/games_dice' )
+
+else
+  # Create a dummy Makefile, to satisfy Gem::Installer#install
+  mfile = open("Makefile", "wb")
+  mfile.puts '.PHONY: install'
+  mfile.puts 'install:'
+  mfile.puts "\t" + '@echo "Extensions not installed, falling back to pure Ruby version."'
+  mfile.close
+
+end