extconf.rb in fiddle-1.1.4

- old
+ new

@@ -1,13 +1,21 @@
 # frozen_string_literal: true
-require 'mkmf'
 
+require "rbconfig"
+
 unless RUBY_ENGINE == "ruby"
-  File.write('Makefile', dummy_makefile("").join)
+  File.write('Makefile', <<-MAKEFILE)
+all install clean:
+	#{RbConfig::CONFIG["NULLCMD"]}
+
+.PHONY: all install clean
+  MAKEFILE
   return
 end
 
+require 'mkmf'
+
 # :stopdoc:
 
 def gcc?
   RbConfig::CONFIG["GCC"] == "yes"
 end
@@ -66,14 +74,9 @@
     $defs.push('-DUSE_HEADER_HACKS')
     have_ffi_header = true
   end
   if have_ffi_header && (have_library('ffi') || have_library('libffi'))
     have_libffi = true
-    checking_for("undefined FFI_GO_CLOSURES is used") do
-      if egrep_cpp(/warning: 'FFI_GO_CLOSURES' is not defined/, cpp_include(ffi_header), "2>&1")
-        $defs.push('-DFFI_GO_CLOSURES=0')
-      end
-    end
   end
 end
 
 unless have_libffi
   if bundle